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Neon tetras are peaceful, small schooling fish that fit well into a wide range of community aquariums — but their small size makes them vulnerable to larger or more aggressive tankmates. The key considerations are size compatibility, temperament, and water parameter overlap. This guide covers the best tankmates for neon tetras, what to avoid, and why.
The Ground Rules
- Size matters: Neon tetras are small — any fish large enough to fit a neon tetra in its mouth is a potential predator. This includes many fish that are commonly sold as community fish.
- Avoid fin-nippers: Neon tetras have relatively short fins, but fin-nipping species will still stress and injure them.
- Match water parameters: Neon tetras prefer soft, slightly acidic water (pH 6.0–7.0, 2–10 dGH). Tankmates should share compatible requirements.
- Keep the school intact: Neon tetras need a school of 6+ (10+ preferred) to feel secure. Overcrowding the tank with too many species at the expense of school size increases stress.
- Tank size: Adding tankmates increases bioload. A 20-gallon tank is a more practical minimum for a neon tetra community setup than the 10-gallon minimum for neons alone.
Good Neon Tetra Tankmates
Corydoras Catfish
Corydoras are one of the most reliable neon tetra tankmates. They are peaceful bottom dwellers that occupy a completely different part of the tank, share compatible water parameters, and are not fin-nippers. They also help clean up uneaten food from the substrate. Keep corydoras in groups of 6+ for best results. A 20-gallon tank with a school of neon tetras and a small cory group is a classic beginner community setup.
Other Small Tetras
Many small tetra species make excellent neon tetra tankmates. Good options include:
- Cardinal tetras — closely related, compatible parameters, can be mixed with neons in soft, acidic water
- Ember tetras — very small, peaceful, good for nano community tanks
- Rummy nose tetras — active schooling fish, peaceful, similar size
- Glowlight tetras — peaceful, similar size and temperament
Avoid fin-nipping tetra species like serpae tetras and black skirt tetras.
Rasboras
Harlequin rasboras, chili rasboras, and lambchop rasboras are all peaceful schooling fish that coexist well with neon tetras. They prefer similar water parameters and are not fin-nippers. Mixed schools of rasboras and neon tetras create an active, colorful mid-water display.
Small Livebearers
Guppies, platies, and endlers are generally compatible with neon tetras in terms of temperament. Water parameter overlap is the main consideration — neon tetras prefer softer, more acidic water than most livebearers. In tanks with neutral pH and moderate hardness, both can coexist, but neither will be in their ideal range. In tanks specifically set up for neon tetras with soft, acidic water, livebearers may not thrive long-term.
Otocinclus
Otocinclus are small, peaceful algae-eating catfish that are completely safe with neon tetras. They share compatible water parameters and occupy the bottom and glass surfaces, leaving the mid-water column to the tetras. Keep in groups of 4–6 in a mature tank with established algae growth or supplemental feeding.
Dwarf Gouramis (With Caution)
Dwarf gouramis can work in larger tanks (30+ gallons) with neon tetras, but require monitoring. Temperament varies by individual — some dwarf gouramis ignore neon tetras completely, while others become territorial. In a well-planted tank with adequate space, they are generally compatible. In smaller tanks, the risk of harassment increases.
Nerite Snails and Mystery Snails
Snails are practical additions to neon tetra tanks. They help consume algae and leftover food, and neon tetras generally ignore them. Nerite snails are the most recommended — they don’t reproduce in freshwater.
Amano Shrimp and Cherry Shrimp
Amano shrimp are large enough that neon tetras generally leave them alone. They are excellent algae and detritus cleaners and share compatible water parameters. Cherry shrimp can coexist with neon tetras in heavily planted aquariums, though newborn shrimplets are likely to be eaten. Adult cherry shrimp are generally ignored.
Tankmates to Avoid
Angelfish
Angelfish are one of the most commonly cited incompatible tankmates for neon tetras. Adult angelfish will eat neon tetras — neons are exactly the right size to be a meal. Juvenile angelfish may coexist temporarily, but as they grow the risk increases significantly. This is a very common mistake in community tank planning.
Tiger Barbs
Tiger barbs are fin-nippers that will stress neon tetras even if they don’t cause serious physical damage. Avoid entirely.
Bettas
Male bettas may attack neon tetras, particularly in smaller tanks where the betta cannot establish territory away from the school. In larger, well-planted tanks some keepers successfully house bettas with neon tetras, but this requires careful monitoring and is not recommended for beginners.
Large Cichlids
Most cichlids are too large and aggressive for neon tetra community tanks. Even smaller cichlids can be problematic. Research carefully before combining any cichlid with neon tetras.
Goldfish
Goldfish are coldwater fish that require different temperatures than neon tetras. The temperature mismatch alone makes this combination unsuitable for long-term keeping. Goldfish will also eat neon tetras as they grow.
How to Introduce Tankmates
- Ensure the tank is large enough for both neon tetras and new tankmates before adding anything
- Quarantine new fish for 2–4 weeks — this is especially important with neon tetras given their susceptibility to neon tetra disease
- Observe closely during the first 48–72 hours for chasing, nipping, or stress behavior
- Ensure neon tetras are getting adequate food — faster or more aggressive feeders may outcompete them