Colombian Tetra
Hyphessobrycon columbianus
Min Tank Size
80L
Adult Size
7 cm
Lifespan
5 years
School Size
8+
About
Native to the lower Atrato and San Juan river drainages in northwestern Colombia, Hyphessobrycon columbianus is one of the chunkier, more substantial tetras you can keep. They've got a silvery-blue body that catches light nicely, with vivid red and blue coloration in the fins, especially noticeable in males when they're in good condition. Compared to a neon or cardinal tetra, these fish are noticeably bigger and more assertive, which is something a lot of beginners don't anticipate when they first add them to a community tank.
Water parameters are forgiving. They do well anywhere from 24 to 28 degrees Celsius, with a pH of 6.0 to 7.5 covering almost any tap water you're likely to encounter. Moderate flow suits them well, reflecting their origin in river systems. They're not fussy eaters either. High-quality flake or micro pellets as a staple, supplemented with frozen bloodworms, daphnia, or brine shrimp, and they'll colour up and stay active year-round.
The temperament is where people get caught off guard. Colombian tetras are fin nippers, full stop. Keeping them in groups of eight or more is not optional for good behavior, it's mandatory. A smaller group becomes bolder about harassing tankmates. Even in adequate numbers, they're not suitable for tanks with slow-moving or long-finned fish.
Given the right setup though, a large school of these moving together is genuinely impressive. Their size, speed, and coloration make them a centerpiece fish rather than a background filler species. Browsing real tank builds featuring Colombian tetras gives a good sense of how different they look between a crowded, stressed school and a properly sized, well-planted setup.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Colombian Tetra together
Colombian Tetra are shoaling fish and need company of their own kind. Keep a group of at least 8. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Colombian tetras work well with similarly sized, robust fish that can hold their own. Good choices include larger rasboras, giant danios, rainbow fish, and mid-sized cichlids that aren't overly aggressive themselves. Corydoras and plecos generally coexist fine since they occupy different zones. Avoid anything with long flowing fins, including bettas, fancy guppies, or angelfish, as these will be nipped repeatedly. Dwarf shrimp are simply prey. In a 200-liter or larger tank a big school of Colombians alongside a group of Melanotaenia rainbowfish is a genuinely stunning combination that works well behaviorally.
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. Six is often cited but eight is where the group dynamic actually stabilizes and nipping toward tankmates drops off. People also underestimate the adult size and end up with seven-centimeter fish in a tank that's too cramped. Feeding variety matters too. Fish kept on flake alone tend to look washed out. Frozen foods once or twice a week make a visible difference in color and energy. They're genuinely hardy though, and bounce back from minor water quality lapses better than most tetras.
Behavior & Aggression
Colombian tetras nip fins, and they're consistent about it. The main trigger is a small school or an underpopulated tank, where individual boldness spikes. Eight is the real minimum for keeping that behavior in check, more is better. Long-finned fish are prime targets, as are slower species that can't get out of the way quickly. Even in adequate numbers they'll occasionally test tankmates, so watch feeding time closely. Aggression between males in the same species is usually just posturing, not genuinely damaging.
Things to Know
- Keep in groups of 8+ or fin nipping becomes a serious problem
- Will eat dwarf shrimp, including adults
- Can outcompete smaller, slower tankmates at feeding time
- Very active swimmers that need a longer tank for their size.
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