Best Tank Mates for Endler's Livebearer: Compatible Fish and Species to Avoid

The best tank mates for Endler's livebearer are small, peaceful fish that like the same warm, moderately hard water: ember tetras, harlequin and chili rasboras, pygmy corydoras, otocinclus, honey gouramis, and invertebrates like Amano shrimp and nerite snails. Avoid anything big enough to swallow an adult male, any fin nipper, and fancy guppies, which will hybridize with your Endlers. Below you'll find a safe/conditional/avoid table, fry-friendly options, and sample stocking plans.

Endler Basics That Shape Every Pairing

Endler's livebearer (Poecilia wingei) is one of the smallest fish in the hobby. Males reach only about 0.8–1 inch (2–2.5 cm), while females grow to about 1.5–1.75 inches (3.8–4.4 cm). Expect a lifespan of about 2–3 years on average; some keepers report longer, but don't plan on it.

They're very peaceful, spend their time in the upper and middle water column, and breed constantly. A healthy female drops fry every 23–30 days, so tank mate choices also decide how many babies survive.

Water parameters your tank mates must share

Parameter	Ideal for Endlers	Tolerated
Temperature	72–82°F (22–28°C)	Down to the mid-60s °F (about 18°C)
pH	7.0–8.0	6.5–8.5
Hardness	Moderate to hard, about 8–20 dGH	—

Sources disagree on temperature (from room temp with no heater to a 75°F minimum) and pH (some cap it at 7.5, others allow 8.4). A practical middle ground: run a heater set to 74–78°F (23–26°C) if your room drops below 70°F (21°C) in winter, and aim for pH 7.0–8.0. That range rules out many soft, acidic-water specialists, which is the most overlooked compatibility problem with this fish.

Tank size and sex ratio

• 5 gallons (19 L): a few males only.
• 10 gallons (38 L): a breeding trio or a small community.
• 20 gallons (76 L): a mixed community with schoolers and bottom dwellers.

If you keep both sexes, use 1 male to 2–3 females so no single female gets chased all day. Or go all-male: males carry all the color, nothing breeds, and an all-male group is a popular choice for a community display.

How to Choose Endler Tank Mates: The Three Filters

1. The mouth-size rule. If a fish's mouth can fit an adult male Endler, it will eventually eat one. In practice, pass on anything over about 3–4 inches (7.5–10 cm) and any predatory species.
2. Temperament. No fin nippers and no bullies. Endler males have small fins, but nippers still harass them.
3. Feeding competition. Hyperactive, fast-eating fish grab everything before tiny-mouthed Endlers get a bite.

Then decide which kind of tank you want:

• Display tank: fry get eaten, and that's fine. It keeps the population in check.
• Colony/breeding tank: only fry-safe mates, lots of plants.

Compatibility Table: Safe, Conditional and Avoid

Species	Verdict	Notes
Ember tetra	Safe	Tiny, peaceful; groups of 6+
Neon tetra	Safe	Tolerates Endler water better than cardinals
Harlequin, chili, phoenix, strawberry rasboras	Safe	Small mouths, calm schoolers
Celestial pearl danio	Safe	Shy; will lose its own eggs to Endlers
Cherry barb	Safe	One of the gentler barbs
Pygmy, habrosus, panda corydoras	Safe	Ideal bottom crew; fry-safe (pygmy)
Kuhli loach	Safe	Needs soft substrate and cover
Otocinclus	Safe	Fry-safe algae grazer; add to a mature tank
Platy, least killifish, merry widow	Safe	Livebearers from other genera, no hybrids
Amano, ghost, cherry shrimp; nerite, mystery, ramshorn snails	Safe	Shrimplets at some risk
Honey gourami	Safe	Calm centerpiece; eats some fry
Zebra danio	Conditional	Only in 20+ gal; fast eaters
Bristlenose pleco	Conditional	20+ gal only
Dwarf gourami	Conditional	Disease risk (see below)
Cardinal tetra, rummy nose tetra	Conditional	Prefer warm, soft, acidic water
Bamboo shrimp	Conditional	Needs a larger tank with good flow
White cloud minnow	Conditional	Unheated, room-temp setups only
Betta	Conditional	Sometimes works; see FAQ
Fancy/common guppy	Avoid	Hybridizes; fancy tails attract nippers
Tiger barb, serpae tetra, black skirt tetra	Avoid	Fin nippers
Angelfish, convicts, African cichlids	Avoid	Will eat Endlers
Large gouramis, red-tail shark	Avoid	Too big or territorial
Goldfish	Avoid	Temperature and bioload mismatch
Pike killifish, large catfish	Avoid	Predators

The Best Fish Tank Mates for Endlers

Small peaceful schoolers

Ember tetras, harlequin rasboras, chili rasboras, phoenix rasboras and strawberry rasboras are near-perfect matches: similar size, tiny mouths, no nipping. Celestial pearl danios (CPDs) add color low in the tank. Cherry barbs are a calm barb that handles harder water. You can browse many of these in FishyHub's small community fishes section.

Neon tetras work well. Cardinal tetras and rummy nose tetras show up on many lists, but they prefer warmer, softer, more acidic water than Endlers. They're conditional picks: fine if your water sits near the soft end of the Endler range, a poor match in hard tap water.

Zebra danios are hardy but fast and greedy at feeding time, so keep them only in 20 gallons or more.

Bottom dwellers and algae crew

Pygmy, habrosus and panda corydoras stay small and keep the substrate clean. Kuhli loaches hide by day and forage at night. Otocinclus graze biofilm and algae and ignore fry. A bristlenose pleco is a good algae eater in 20+ gallon tanks. Browse options in the corydoras category.

Centerpiece fish

The honey gourami is a peaceful, slow centerpiece that works in 10–20 gallon communities. The dwarf gourami is also peaceful, but many are carriers of dwarf gourami iridovirus, an untreatable disease. Buy only from a source you trust, and quarantine carefully.

Livebearing tropical fish: which to mix

Livebearer	Fit with Endlers	Why
Guppy	Avoid	Same genus; hybridizes
Platy	Good	Different genus, peaceful
Molly	Fair	Grows to 4+ in (10+ cm), prefers harder water
Swordtail	Fair	Large; males can be pushy
Least killifish	Excellent	Tiny, peaceful nano mate
Merry widow	Excellent	Peaceful, no hybrid risk
Pike killifish	Avoid	A predator despite being a livebearer

Merry widows (Phallichthys) deserve a closer look. This peaceful Central American livebearer has females up to about 2.5 inches (6.4 cm) and males about 1.25 inches (3.2 cm), likes neutral water at 72–80°F (22–27°C), and belongs to a different genus, so there's no hybridization risk.

Cool-water option

White cloud minnows prefer 64–72°F (18–22°C), which overlaps only the bottom of the Endler range. Pair them only in unheated tanks that stay in the low 70s °F (about 21–23°C).

Endlers With Shrimp and Snails

Neocaridina (cherry shrimp) and Amano shrimp do best with Endlers. Ghost shrimp also work. Some keepers say Endlers ignore shrimp; others say they hunt them. The truth sits in between: adults are safe, shrimplets are at risk.

To keep a shrimp colony growing:

• Establish the shrimp first, before adding Endlers.
• Grow thick java moss and other cover.
• Keep flow gentle and put a sponge on the filter intake.
• Accept some shrimplet losses.

Nerite, mystery and ramshorn snails are completely safe. Shop the shrimp category if you're adding an invert crew.

Species to Avoid

• Common and fancy guppies: they hybridize with Endlers, and fin nippers target fancy guppy tails. Skip them if you care about a pure line.
• Bettas: may attack colorful males as rivals. It only sometimes works.
• Fin nippers: tiger barbs, serpae tetras, black skirt tetras.
• Most cichlids: angelfish, convicts and African cichlids all eat Endlers.
• Large gouramis and red-tail sharks: too big or too territorial.
• Goldfish: cold water and a heavy bioload don't suit Endlers.
• Predators: pike killifish and large catfish.

Sample Stocking Plans

10 gallons (38 L), community:

• 1 male + 2 female Endlers (or 5–6 males)
• 6 ember tetras or chili rasboras
• A few cherry shrimp and 1–2 nerite snails

20 gallons (76 L), community:

• 6–8 male Endlers (or a 1:2–3 breeding group)
• 8 harlequin rasboras or neon tetras
• 6 pygmy or panda corydoras
• 2–3 otocinclus, or 1 honey gourami
• Amano shrimp and nerite snails

Fry Control and Protecting Eggs

Want fewer babies? Add mates that eat fry: tetras, gouramis, even African dwarf frogs. Or go all-male.

Want more babies? Keep only fry-safe mates (otos, pygmy cories, shrimp, snails) and plant heavily with java moss, water sprite, hornwort, guppy grass and floating plants. Use a sponge filter or a pre-filter sponge on the intake, and keep flow gentle.

Endlers are fry eaters too. Egg scatterers like CPDs and rasboras will lose eggs to them, and adult Endlers will pick at their own fry. If you want to raise any of these, use a breeder box, a separate grow-out tank, or thick moss.

Feeding Fry and Live Foods

Endler fry are born able to eat crushed flake and baby brine shrimp right away. Unlike egg-layer fry, they don't need an infusoria stage. Feed 3–5 small meals a day.

• Baby brine shrimp: a hatchery with salted water at about 80°F (27°C) hatches eggs in roughly 24 hours.
• Moina and daphnia: easy home cultures that adults and fry both eat.
• Mosquito larvae: a good treat, but it's an outdoor culture. Follow local rules and harvest completely so none hatch.

Stocking Order and Acclimation

1. Quarantine every new fish for 2–4 weeks.
2. Add peaceful schoolers in groups of 6 or more.
3. Add bottom dwellers and otos last, once the tank has grown biofilm.
4. Feed small, fine foods so Endlers' tiny mouths get their share.

To acclimate, float the bag for 15–20 minutes, then drip or add tank water gradually over 30–45 minutes. Net the fish into the tank rather than pouring in bag water, and leave the lights off for a few hours.

Are Endlers Schooling Fish?

No. Endlers and guppies are loose shoalers, not true schoolers. Keep at least 3; they'll swim closer together when they feel threatened.

Keeping Lines Pure

If you keep Endlers for their genetics, know the difference between N-class (pure, documented) stock and hybrids. Buy from breeders who track their lines, separate or cull hybrids, and never mix in guppies. And in the US, never release unwanted fish or fry into ponds, lakes or streams.

Common Mistakes and Troubleshooting

• Fancy guppies in the tank: you'll get hybrids.
• Too many males, too few females: females get stressed and die.
• Soft-water mates in hard water: one species always suffers.
• Fin nippers or big-mouthed fish: lost males.
• Fry overload: add fry predators, go all-male, or rehome extras to local stores or clubs.
• Shrimplets disappearing: add moss and a sponge on the intake.
• Endlers hiding or clamping fins: check for a bully, check the temperature, test ammonia.

Why is my Endler dying?

Usual causes are ammonia or nitrite from an uncycled tank, pH or hardness shock, harassment from too many males or a bully, disease brought in by unquarantined fish, or the "shimmies" caused by soft water or temperature swings.

Frequently Asked Questions

Can Endlers live with guppies?

Physically, yes. But Endlers and guppies interbreed freely, so the fry are hybrids. Avoid the pairing if you want to keep your Endler line pure.

Can Endlers live with a betta?

Sometimes. It has the best chance in a 10+ gallon planted tank with drab female Endlers or an all-female group, since bright males can look like rivals. Watch closely and have a backup tank ready.

Will Endlers eat cherry shrimp?

Adult cherry shrimp are safe. Endlers will pick off some shrimplets, so thick moss and other cover keep the colony growing.

How many Endlers can go in 10 gallons?

Start with one male and two females, or keep 5–6 males only for a no-breeding tank. A trio will multiply quickly, so plan for fry.

Do Endlers need a heater?

Usually, in US homes. Set it to 74–78°F (23–26°C), especially if the room drops below 70°F in winter.

Can Endlers go in a pond or tub in summer?

Yes, as long as the water stays above about 65°F (18°C). Bring them indoors before fall nights cool the water.

Build Your Endler Community

Start with water that suits your Endlers, then add small, peaceful mates that share it and can't fit a male in their mouth. When you're ready to stock, browse FishyHub's freshwater livestock for schoolers, bottom dwellers and invertebrates that fit your tank.