Head and Tail Light Tetra
Hemigrammus ocellifer
Min Tank Size
60L
Adult Size
4.5 cm
Lifespan
5 years
School Size
6+
About
Native to South America, ranging across river basins in Guyana, Brazil, and surrounding regions, Hemigrammus ocellifer has been a staple of the aquarium hobby since the mid-twentieth century. Two iridescent copper-gold spots are the giveaway: one just above and behind the eye, another at the base of the tail. Under a good light, those spots practically glow, which is exactly why the common name stuck. The body itself is a translucent silver with a faint rosy blush, making them look especially striking against dark substrate or dense planting.
These are genuinely forgiving fish for beginners. They accept a wide pH range from about 6.0 to 7.8 and tolerate temperatures between 22 and 28 degrees Celsius without complaint. Soft to moderately hard water suits them fine, though they'll show their best coloration in slightly acidic, tannin-stained water. Feeding is no drama either. They readily take high-quality flakes or micro pellets as a staple, and a few times a week of frozen or live bloodworms, daphnia, or baby brine shrimp keeps them in excellent condition.
In the tank they're energetic and always on the move, darting through open midwater space in tight formation when comfortable. A well-planted aquarium with some open swimming room is ideal. They don't demand much, but they do need company: a lone individual or a tiny group will hide constantly and look washed out. Put six or more together and the whole dynamic changes.
For anyone building a classic community setup, head and tail lights are one of those reliable choices that rarely disappoint. Browsing tank builds that feature this species is a great way to see how they look alongside different plant arrangements and tankmates.
Water Parameters
Temperature
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GH
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Flow Preference
Keeping multiple Head and Tail Light Tetra together
Head and Tail Light 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
Head and tail lights are excellent community fish and mix well with a wide range of similarly sized, peaceful species. Classic pairings include other small tetras like rummy noses or black phantoms, rasboras, small danios, corydoras along the bottom, and peaceful dwarf cichlids like apistogrammas or German blue rams if water parameters align. Avoid putting them with anything large enough to eat them or known fin nippers like tiger barbs, which can harass their somewhat delicate fins. Small ornamental shrimp like neocaridina can coexist successfully in most cases, though very small juveniles or baby shrimp carry some risk. A 60-liter tank works for a small school, but 80 liters or more gives the whole setup more breathing room.
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 of them. A group of three looks sad, stays hidden, and never shows the schooling behavior that makes them interesting. Six is the starting point for welfare, eight or more is where they really come alive. Beyond that, they're not demanding. Water quality matters more than perfect parameters: stable, clean water in the acceptable range beats pristine parameters with large fluctuations. Beginners sometimes skip varied feeding and wonder why colors look dull. A mix of quality dry food and occasional live or frozen food makes a real visible difference in their vibrancy.
Behavior & Aggression
Head and tail light tetras are about as peaceful as tetras get. There's no meaningful aggression toward other species, and even within their own group, any squabbling is limited to brief, harmless chasing that's really just social hierarchy sorting. They don't fin-nip, they don't hog territory, and they don't stress out calmer tank inhabitants. The only caveat is that a very small group in a sparse tank can lead to skittish, nervous behavior, which some people misread as aggression when it's really just stress from inadequate numbers.
Things to Know
- Keep in groups of 6 or more or they become skittish and stressed.
- May occasionally pick at very small dwarf shrimp or shrimp fry.
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