Tank mates by speciesTM-07
Medaka Tank Mates: 22 Species Rated ○△× with Reasons, plus Tropical Fish, Shrimp, Nerite Snails, Goldfish and No Heater
Medaka are safe with shrimp and nerite snails. With tropical fish, temperature and heater needs differ, so those pairs are △ or ×.
In this article (16 sections)
- In short: which animals are safe tank mates for medaka?
- In what order should you check medaka tank mates?
- Can medaka live with tropical fish?
- With no heater, which tank mates can you choose for medaka?
- Can medaka live with shrimp?
- For algae with medaka, are shrimp or nerite snails better?
- Can medaka live with goldfish?
- What about medaka tank mates outdoors or in a biotope?
- What should you do with tank mates when there are medaka eggs or fry?
- How should you think about tank size and numbers for medaka tank mates?
- What should you do before adding tank mates for medaka?
- What are common mistakes with medaka tank mates?
- What terms come up with medaka tank mates?
- What else goes with medaka tank mates?
- Sources
In short: which animals are safe tank mates for medaka?
Medaka are safe with three kinds of shrimp, such as Neocaridina shrimp, and with nerite snails. With tropical fish, most pairs are △ or ×.
Medaka (Japanese rice fish) are small Japanese fish you can keep without a heater. Shop guides also recommend partners that are gentle and too big to be swallowed.
The hard part is pairing them with tropical fish. Some guides say "you can keep them together" and others say "not a good match," and the reasons do not line up.
This site works out compatibility from care data for 22 species. It lists the temperature overlap and the need for a heater as the reasons.
What this article covers:
- Compatibility with 22 species, and why some pairs are △ or ×
- How to think about temperature and heaters when pairing with tropical fish
- Partners you can choose with no heater, or outdoors
- Shrimp and nerite snail pairs, and which to use for algae
- What to watch when keeping medaka with goldfish
○ Generally compatible (4)
- Japanese swamp shrimpNeocaridina shrimp are suited to living with medaka (manufacturer guide) (GEX (keeping Neocaridina shrimp))
- Cherry shrimp
- Amano shrimp
- Nerite snailNerite snails suit medaka (Seriously Fish (Oryzias latipes))
△ With care (11)
- Neon tetraTemperature overlap is narrow (21–22°C) / Neon tetra is a tropical fish that needs a heater; Medaka does not
- GuppyGuppy is a tropical fish that needs a heater; Medaka does not
- PlatyPlaty is a tropical fish that needs a heater; Medaka does not
- OtocinclusTemperature overlap is narrow (21–22°C) / Otocinclus is a tropical fish that needs a heater; Medaka does not
- Harlequin rasboraTemperature overlap is narrow (21–22°C) / Harlequin rasbora is a tropical fish that needs a heater; Medaka does not
- Zebra danioZebra danio is a tropical fish that needs a heater; Medaka does not
- Cherry barbCherry barb is a tropical fish that needs a heater; Medaka does not
- Tiger barbTiger barb is a tropical fish that needs a heater; Medaka does not / Tiger barb may nip other fish's fins
- Kuhli loachTemperature overlap is narrow (21–22°C) / Kuhli loach is a tropical fish that needs a heater; Medaka does not
- Bristlenose plecoTemperature overlap is narrow (21–22°C) / Bristlenose pleco is a tropical fish that needs a heater; Medaka does not
- GoldfishListed as a goldfish tank mate, provided it is too big for the goldfish's mouth (RSPCA Australia (goldfish care))
× Not recommended (7)
- Cardinal tetraNo overlap in temperature (Cardinal tetra 23–29°C, Medaka 16–22°C) / Cardinal tetra is a tropical fish that needs a heater; Medaka does not
- Rummy-nose tetraNo overlap in temperature (Rummy-nose tetra 23–26°C, Medaka 16–22°C) / Rummy-nose tetra is a tropical fish that needs a heater; Medaka does not
- Betta (male)No overlap in temperature (Betta (male) 22–30°C, Medaka 16–22°C) / Betta (male) is aggressive and chases other fish / Betta (male) is a tropical fish that needs a heater; Medaka does not
- AngelfishNo overlap in temperature (Angelfish 24–30°C, Medaka 16–22°C) / Medaka is small enough for Angelfish to eat / Angelfish is a tropical fish that needs a heater; Medaka does not
- Panda coryNo overlap in temperature (Panda cory 22–25°C, Medaka 16–22°C) / Panda cory is a tropical fish that needs a heater; Medaka does not
- Peppered coryNo overlap in temperature (Peppered cory 22–26°C, Medaka 16–22°C) / Peppered cory is a tropical fish that needs a heater; Medaka does not
- Dwarf gouramiNo overlap in temperature (Dwarf gourami 22–27°C, Medaka 16–22°C) / Dwarf gourami is a tropical fish that needs a heater; Medaka does not
Source: Judged by this site's rules from the care data of each species (see the sources of the care data table)
The list above, grouped by result:
| Result | Partners | Main reason |
|---|---|---|
| ○ Easy to keep together | Neocaridina shrimp, Amano shrimp, red cherry shrimp, nerite snail | Temperatures overlap, and neither eats the other |
| △ With conditions | 10 tropical fish such as the neon tetra, guppy and platy, plus the goldfish | Heater needs differ, or the temperature overlap is narrow |
| × Not suitable | 7 species such as the cardinal tetra, betta (male), angelfish and the two corydoras | Temperatures do not overlap |
The key point: for medaka, whether the partner needs a heater almost decides the answer.
In what order should you check medaka tank mates?
Check medaka tank mates in this order: temperature, mouth size, temperament, then shrimp. Most tropical fish fail at the first step, temperature.
Applied to medaka, the four steps look like this.
| What to check | For medaka | Partners that fail |
|---|---|---|
| Do temperatures overlap? | Lower suitable temperature than tropical fish (see the table). No heater needed | All tropical fish (△ or ×) |
| A size gap big enough to swallow | Small body, on the eaten side | Angelfish, goldfish |
| Fin nipping and temperament | Peaceful | Betta (male), tiger barb |
| Does it eat shrimp? | No source found saying it eats baby shrimp | None (all three shrimp are ○) |
The order matters. A partner whose temperature does not match cannot live long in the same tank, even if everything else matches.
For medaka, checking temperature and heater needs first screens out most partners.
Can medaka live with tropical fish?
Medaka with tropical fish are △ or ×. Medaka need no heater, so their suitable temperature differs from that of tropical fish.
Search suggestions also show "tropical fish that can live with medaka" and "medaka neon tetra." Both are peaceful small fish.
But they like different temperatures. Seriously Fish describes medaka as a temperate to subtropical fish. It also writes that constantly warm water can shorten their lives.
| Species | Temperature (°C) | Swimming level | Group size (or more) |
|---|---|---|---|
| Neon tetra | 21–25 | Middle | 8 |
| Cardinal tetra | 23–29 | Middle | 8 |
| Guppy | 17–28 | Top | 3 |
| Platy | 20–26 | Top | 3 |
| Panda cory | 22–25 | Bottom | 6 |
| Zebra danio | 18–25 | Middle | 8 |
| Medaka | 16–22 | Top | 8 |
Source (7)
As the table shows, tropical fish like water at the top end of the medaka range or above it. How much the ranges overlap splits △ from ×.
| Result | Tropical fish | Reason |
|---|---|---|
| △ | Neon tetra, otocinclus, harlequin rasbora, kuhli loach, bristlenose pleco | Narrow temperature overlap, and different heater needs |
| △ | Guppy, platy, zebra danio, cherry barb | Temperatures overlap, but heater needs differ |
| △ | Tiger barb | Different heater needs, and it sometimes nips fins |
| × | Cardinal tetra, rummy-nose tetra, dwarf gourami | Temperatures do not overlap |
| × | Panda corydoras, peppered corydoras | Temperatures do not overlap |
| × | Betta (male), angelfish | Temperatures do not overlap, and they chase medaka or can swallow them |
Some shop guides name neon tetras or corydoras as partners for medaka. Those guides assume the water is heated.
In this site's calculation, corydoras are × with medaka because their suitable temperatures do not overlap. Neon tetras are △ because the overlap is narrow.
If you pair medaka with tropical fish, put a thermometer at eye level. Then you can check every day that the water suits the medaka.
Heating the water for tropical fish keeps it warm for medaka all the time. Medaka and tropical fish are easier to manage in separate tanks.
Compatibility from the tropical fish's side is in Neon Tetra Tank Mates and Guppy Tank Mates.
With no heater, which tank mates can you choose for medaka?
With no heater, the three shrimp and the nerite snail are ○. Do not add tropical fish that need a heater.
This site puts animals that survive winter in Japanese rivers and ponds on the "no heater needed" side. Seen from the medaka, there are five.
| Animal | With medaka | Role and breeding |
|---|---|---|
| Neocaridina shrimp | ○ | Eats algae and leftover food. Breeds in the tank |
| Amano shrimp | ○ | Eats algae and leftover food. Does not breed in captivity |
| Red cherry shrimp | ○ | Has no larval stage, and breeds in the tank |
| Nerite snail | ○ | Eats algae. No baby snails hatch in the tank |
| Goldfish | △ | The gap in mouth size widens as it grows |
The red cherry shrimp came to Japan from abroad. A University of Florida guide says it has also been found in rivers in eastern Japan.
Goldfish also need no heater, so matching temperatures is easy. They are still △ because of the gap in mouth size.
Without a heater, the shortcut is to choose medaka tank mates from shrimp and snails.
Can medaka live with shrimp?
Yes. Neocaridina shrimp, Amano shrimp and red cherry shrimp are all ○ with medaka.
Search suggestions also show "shrimp that can live with medaka" and "how many shrimp with medaka."
GEX describes Neocaridina shrimp as well suited to living with medaka. They are small cleaners that eat algae and leftover food in the tank.
| 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|
| 1Medaka | · | ○ | ○ | ○ | ○ |
| 2Japanese swamp shrimp | ○ | · | ○ | ○ | ○ |
| 3Amano shrimp | ○ | ○ | · | ○ | ○ |
| 4Cherry shrimp | ○ | ○ | ○ | · | ○ |
| 5Nerite snail | ○ | ○ | ○ | ○ | · |
○ Generally compatible △ With care × Not recommended
Source: Judged by this site's rules from the care data of each species (see the sources of the care data table)
As the quick chart shows, shrimp with shrimp, and shrimp with the nerite snail, are also ○. You can add them all to a medaka tank.
Neocaridina shrimp and Amano shrimp breed in different ways.
| What to look at | Neocaridina shrimp | Amano shrimp |
|---|---|---|
| Breeds in the tank | Yes | Not in captivity (the larvae grow up in the sea) |
| As a cleaner | Eats algae and leftover food | Eats algae and leftover food |
| Baby shrimp | Safer with plants and hiding places | None are born |
| Size | Smaller (see the table) | Larger (see the table) |
By this site's temperature calculation alone, medaka and Neocaridina shrimp would be ×. A maker's guide says they suit each other, so we mark them ○.
The sources we checked did not say whether medaka eat baby shrimp. A US specialist shop writes that most fish eat baby shrimp.
If you want the shrimp to breed, add plenty of plants. They give newborn baby shrimp places to hide.
Start with a few shrimp, then add more as you watch how fast algae and leftovers go down. Compatibility from the shrimp's side is in Shrimp Tank Mates.
For algae with medaka, are shrimp or nerite snails better?
Both shrimp and nerite snails work for algae. Both are ○ with medaka, so choose by whether you want them to breed.
Search suggestions also show "medaka tank mates algae eaters" and "nerite snail with medaka."
Seriously Fish says many nerites suit medaka as partners. Nerites are the group of snails that includes the nerite snail (Clithon retropictus, ishimaki-gai).
| Algae eater | With medaka | Breeds? | Best use |
|---|---|---|---|
| Neocaridina shrimp | ○ | Breeds in the tank | Keep long term as they multiply |
| Red cherry shrimp | ○ | Breeds in the tank | Enjoy the red color as they multiply |
| Amano shrimp | ○ | Does not breed in captivity | Manage the number you added |
| Nerite snail | ○ | No baby snails hatch | Manage the number you added |
Tokyo Aqua Garden says nerite snails do not breed in the tank, so there is little worry about too many. They may lay eggs on the glass and leave white marks.
The same guide says nerite snails sometimes flip over. If you find one on its back, turn it upright.
If you want to avoid too many, Amano shrimp and nerite snails, which do not breed in fresh water, are easier to manage.
Can medaka live with goldfish?
Medaka with goldfish are △ (with conditions). The condition is that the medaka is larger than the goldfish's mouth, and that breaks down as the goldfish grows.
Search suggestions also show "medaka goldfish tank mates" and "medaka goldfish biotope."
RSPCA (an Australian animal welfare group) names the golden medaka as a partner for goldfish. The condition is that the partner is larger than the goldfish's mouth.
Some specialist shops in Japan list goldfish as unsuitable partners, because goldfish sometimes eat medaka.
| Species | Adult size (cm) | Temperature (°C) | Swimming level |
|---|---|---|---|
| Medaka | 4 | 16–22 | Top |
| Goldfish | 10 | 20–24 | Middle |
Source: Seriously Fish (Oryzias latipes) / RSPCA Australia: How should I care for my goldfish?
As the table shows, adult goldfish grow much larger than medaka. Even if they are the same size when you buy them, the gap keeps widening.
If you pair medaka with goldfish, think about the goldfish's mouth after it grows, not its size today.
To protect medaka, a tank separate from goldfish is the surest choice. Compatibility from the goldfish's side is in Goldfish Tank Mates.
What about medaka tank mates outdoors or in a biotope?
Outdoors or in a biotope, choose shrimp and snails that need no heater. The water temperature changes with the seasons, so do not add tropical fish.
Search suggestions also show "medaka tank mates outdoors" and "medaka tank mates biotope." A biotope is a container made to look like a natural waterside, with plants and animals.
Seriously Fish describes medaka as fish that live through seasonal temperature changes in the wild. It also says that in most homes, no heater all year round suits them.
| Location | Water temperature | Partners you can choose |
|---|---|---|
| Outdoors or biotope | Rises and falls with the seasons | The three ○ shrimp and the nerite snail |
| Indoors, no heater | Follows room temperature | The three ○ shrimp and the nerite snail. Goldfish are △ |
| Indoors, with a heater | Can be kept steady | Tropical fish are △ or ×. Keep the temperature on the medaka side |
Tokyo Aqua Garden lists crayfish, frogs and carnivorous fish as animals unsuited to medaka. Do not add them to outdoor containers either.
Outdoors, limit medaka tank mates to shrimp and snails that need no heater.
What should you do with tank mates when there are medaka eggs or fry?
If you want eggs or fry to survive, raise them in a separate container. Seriously Fish says medaka are best kept on their own if you want them to breed.
According to the same source, adult medaka often leave eggs alone. But they do eat fry once the fry start swimming.
It also says some fry survive in a tank with thick plants.
| Situation | What tends to happen | What to do |
|---|---|---|
| Fry have started swimming | Adult medaka eat the fry | Move the fry to another container |
| Few plants | Fry have nowhere to hide | Grow plants thickly |
| With shrimp or snails | Sources do not confirm whether they eat fry | Raise the fry in another container |
| With other medaka relatives | Risk of hybridization | Keep medaka relatives apart |
The last row is a warning from Seriously Fish. It advises against keeping medaka with other members of their genus (Oryzias), because they may hybridize.
In the season when you want more fry, keep the community tank and the rearing container separate.
How should you think about tank size and numbers for medaka tank mates?
Keep medaka at or above the group size in the table. For a group, Seriously Fish recommends a tank base of at least 45 cm wide × 30 cm deep.
These are the tank guidelines from the Seriously Fish entry on medaka.
| Item | Guideline |
|---|---|
| Tank base | At least 45 cm wide × 30 cm deep (for a group) |
| Number of fish | At least the group size (see the table) |
| With their own kind | They rarely fight |
| As a group | They swim more calmly in a group |
| Heater | In most homes, none all year round suits them |
This site's data has no group size for shrimp or snails. Add a few, then add more as you watch algae and leftovers go down.
Decide the medaka group first, then fit shrimp and snails into the space left. That makes the numbers easier to set.
What should you do before adding tank mates for medaka?
Before adding tank mates, watch new animals in a separate container first. A University of Florida guide recommends watching them for at least 30 days.
These are the steps from the University of Florida (UF/IFAS) guides, in order.
- Look up the partner's needs (temperature, heater, temperament)
- Do not choose animals that are weak or show signs of disease
- Watch new animals in a separate container for at least 30 days
- Get them used to the main tank's water little by little, then release them
If you pair medaka with shrimp, choose pesticide-free plants. GEX says plants with pesticides on them can wipe out shrimp.
Not putting new animals straight into the main tank does the most to prevent tank-mate failures.
What are common mistakes with medaka tank mates?
There are three common mistakes: keeping the water heated for tropical fish, pairing with small goldfish, and adding plants with pesticides.
| Common mistake | What happens | What to do instead |
|---|---|---|
| Keeping the water heated for tropical fish | Medaka live in warm water all the time | Use separate tanks |
| Pairing with cardinals or corydoras | Temperatures do not overlap | Choose from shrimp and snails |
| Pairing with small goldfish | Once grown, goldfish can swallow medaka | Keep goldfish in a separate tank |
| Adding plants with pesticides | Shrimp can be wiped out | Choose pesticide-free plants |
| Leaving fry in the same tank | Adult medaka eat the fry | Raise them in another container |
| Adding new animals right away | Brings in disease | Watch them in another container for at least 30 days |
If you see it is not working, move the chaser or the weakened animal to another container. The basic fix for a bad match is to separate them, not to make them put up with it.
What terms come up with medaka tank mates?
| Term | Meaning |
|---|---|
| Tank mates (混泳) | Keeping different kinds of fish or shrimp together in the same tank |
| Heater (ヒーター) | A device that warms the water and keeps the temperature steady |
| Suitable temperature (適温) | The range of water temperature in which an animal does well |
| Biotope (ビオトープ) | A container made to look like a natural waterside, with plants and animals |
| Fry, baby shrimp (稚魚, 稚エビ) | Newborn, small fish and shrimp |
| Larva (幼生) | A young animal just out of the egg that looks different from its parents |
| Nerites (ネリテ類) | The group of snails that includes the nerite snail |
| Quarantine container (様子見の容器) | A separate container for new animals before they go into the main tank |
What else goes with medaka tank mates?
Medaka tank mates connect to compatibility with shrimp, goldfish and tropical fish. Go on to the article for the partner you are curious about.
- Shrimp and snails: Shrimp Tank Mates
- Goldfish: Goldfish Tank Mates
- If you pair with tropical fish: Neon Tetra Tank Mates
- All 22 species at once: Tropical Fish Tank Mates Chart
Tank mates by speciesGoldfish Tank Mates: 22 Species Rated ○△× with Reasons, plus Tropical Fish, Shrimp, Medaka, Cleaners and Goldfish VarietiesGoldfish tank mates for 22 species, rated ○△× with reasons. Why small fish and shrimp are ×, why tropical fish are △, medaka, nerite snails and tank size.
Shrimp and snailsWhich Fish Can Live with Shrimp? Neocaridina and Amano Ratings, Hiding Places, AcclimationShrimp tank mates rated ○△× with reasons for Neocaridina and Amano shrimp. Fish that eat baby shrimp vs adults, willow moss hiding places and acclimation steps.
Tank-mate chartTropical Fish Tank Mates Chart: 23 Species Rated ○△× with Reasons, Safe Sets and MistakesCheck tropical fish tank mates in order: temperature, size, fins and temperament, then shrimp. A ○△× chart for 23 species with reasons, safe sets and mistakes.
Tank mates by speciesNeon Tetra Tank Mates: 22 Species Rated ○△× with Reasons, plus Medaka, Shrimp, CardinalsNeon tetra tank mates for 22 species, rated ○△× with reasons. Bettas, angelfish and goldfish are ×. Medaka, tiger barbs, shrimp and cardinals, with sources.Frequently asked questions about medaka tank mates
What animals can live with medaka?
The three shrimp and the nerite snail suit them. Among this site's 22 species, these four are ○.
Tropical fish and goldfish are △ or ×. If you are unsure, pick two species in the checker and read the reason.
Can medaka live with neon tetras?
△ (with conditions). The temperature overlap is narrow, and their heater needs differ.
If you keep them together, hold the temperature inside the range where the two overlap.
Can medaka live with Neocaridina shrimp?
Yes. They are ○, and GEX also says the shrimp suit living with medaka.
If you want baby shrimp to survive, add plenty of plants.
Can medaka live with corydoras?
We do not recommend it. Both panda and peppered corydoras are × with medaka, because their suitable temperatures do not overlap.
On the bottom of a medaka tank, the ○ nerite snail or Neocaridina shrimp fit well.
Can medaka live with weather loaches (dojo)?
Weather loaches are not among this site's 23 species, so we have not calculated their compatibility.
Tokyo Aqua Garden names the bottom-dwelling weather loach as a partner for medaka. It also writes that a weather loach that has grown large sometimes attacks medaka. If you add one, first look up how big it grows.
Does a medaka tank need a heater?
For medaka alone, most homes do not need one. Seriously Fish says no heater all year round suits them.
Adding tropical fish means you need a heater, so compatibility drops to △ or lower.
Sources
- Seriously Fish: Oryzias latipes (medaka. Temperate to subtropical fish, seasonal temperature changes, no heater suits them, warm water and lifespan, tank base, groups, nerites as good partners, eggs and fry, hybridizing with other medaka relatives)
- GEX: Fish and cleanup crew recommended for MeGreen (MeGreen推奨のお魚とお掃除屋さん, in Japanese. Neocaridina shrimp suit living with medaka, algae and leftovers, baby shrimp and plants, pesticide-free plants, Amano shrimp do not breed in captivity)
- RSPCA Australia: How should I care for my goldfish? (golden medaka as a partner, partners must be larger than the goldfish's mouth)
- Tokyo Aqua Garden: Fish and animals you can keep with medaka (メダカと一緒に飼える魚や生き物, in Japanese. Neon tetras and corydoras assume a heater, weather loaches, unsuitable animals, goldfish sometimes eat medaka)
- Tokyo Aqua Garden: Nerite snail (石巻貝, in Japanese. No baby snails in the tank, eggs on the glass, flipping over)
- UF/IFAS EDIS IN1301: Cherry Shrimp (no larval stage, also found in rivers in eastern Japan)
- Aquarium Co-Op: Cherry Shrimp Tank Mates (most fish eat baby shrimp)
- UF/IFAS EDIS FA006: Ichthyophthirius multifiliis (White Spot) Infections in Fish (watch new fish for at least 30 days)
- UF/IFAS EDIS FA124: The Ornamental Fish Trade (watching before adding, acclimating to the water, looking up the partner's needs)
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