Lemon Tetra
Hyphessobrycon pulchripinnis
Min Tank Size
75L
Adult Size
4.5 cm
Lifespan
5 years
School Size
6+
About
Native to the Amazon basin in South America, lemon tetras come from slow-moving, heavily vegetated waters with soft, acidic conditions.
They're one of those fish that rewards patience. Under cheap lighting in a bare tank they look almost translucent and unremarkable, but drop a school into a well-planted setup with good water quality and dark substrate, and that lemon-yellow body really pops. The bright red upper iris is the detail that tends to surprise people who've only seen them in a store tank. It's genuinely striking once you notice it.
They're not demanding fish. A pH anywhere from 6.0 to 7.5 works, though they do best toward the softer, slightly acidic end of that range. Temperature can sit comfortably between 23 and 28 degrees Celsius. They'll eat just about anything you offer, from quality flake food to micro pellets, frozen daphnia, bloodworm, or brine shrimp. Varied feeding keeps their color vivid and their immune system solid.
Lemon tetras tend to get overlooked at the fish store because they sit next to neon tetras and cardinal tetras, which have far more immediate visual punch. That's a shame, because lemons are arguably easier to keep, hardier, and hold their color better long-term in a well-maintained tank.
They're genuinely peaceful, rarely bother tankmates, and spend their days actively exploring mid-water in a loose school. They're a solid choice for anyone building a community tank who wants movement, color, and very little drama. Browse actual tank builds featuring lemon tetras to see just how different they can look once they're settled into a proper setup.
Water Parameters
Temperature
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GH
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Flow Preference
Keeping multiple Lemon Tetra together
Lemon Tetra are shoaling fish and need company of their own kind. Keep a group of at least 6. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Lemon tetras are easy to pair with just about anything that won't eat them. Other small community tetras like rummy-nose, ember, or harlequin rasboras make natural companions. Corydoras catfish work well sharing the lower levels while lemons cruise mid-water. Peaceful dwarf cichlids like apistogramma can coexist successfully if the tank is large enough and has plenty of cover. Avoid large or boisterous fish that will stress them, and be cautious with dwarf shrimp since lemons will occasionally pick at juveniles or freshly molted adults. They're not dedicated shrimp predators, but small shrimp aren't entirely safe either.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common mistake is keeping too few. A group of three or four lemon tetras in a bare tank looks nothing like a school of eight in a planted setup. Color, confidence, and activity level all drop with smaller groups. Water quality matters more than hitting exact parameters. They're tolerant of a range of conditions but won't forgive chronic poor filtration or neglected water changes. Diet is often oversimplified too. Flake alone is fine for survival, but rotating in frozen foods like daphnia or brine shrimp makes a noticeable difference in color intensity and long-term health.
Behavior & Aggression
Lemon tetras are about as non-aggressive as tetras get. They don't nip fins, they don't hassle smaller tankmates, and there's no meaningful hierarchy-related aggression within the school. You might see very brief chasing between males during spawning behavior, but it's fleeting and harmless. The only caveat worth mentioning is that like most small tetras, a tiny school of three or four fish may show slightly more skittish or erratic behavior, which can sometimes translate to brief squabbles. Keep six or more and this essentially disappears.
Things to Know
- Keep in groups of 6+ or colors and activity suffer noticeably.
- May pick at dwarf shrimp, especially juveniles and newly molted shrimp.
- Color fades dramatically with stress or poor water.
- Can be shy, a larger school helps build confidence.
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