Rosy Barb
Pethia conchonius
Min Tank Size
110L
Adult Size
10 cm
Lifespan
5 years
School Size
6+
About
Native to South Asia, from Pakistan through India and into Bangladesh and Myanmar, Pethia conchonius is a widespread species found in streams, rivers, and ponds with quite variable conditions. That range explains its legendary toughness.
Males are the showstoppers here: a deep rosy-pink flush covers most of the body, intensifying to almost red around breeding time, with black-edged fins and a faint iridescent sheen. Females are noticeably more subdued, silver-green with a hint of gold, though they fill out rounder when well-fed.
This is a bigger fish than people expect. Fourteen centimeters is a real adult size, not a stretch, so a 90-liter tank is a true minimum and something in the 150-liter range suits a proper group much better. 0 works fine, and the cold tolerance is genuinely impressive, with healthy fish handling temperatures down to about 15 degrees Celsius without complaint. That makes them a solid choice for unheated indoor setups in temperate climates.
Feeding is straightforward since they accept virtually anything: quality flake, micro pellets, frozen bloodworm, daphnia, and blanched vegetables all disappear quickly. Soft-leaved plants may get nibbled, especially if the fish are underfed or understocked, so tougher species like Java fern or Anubias hold up better.
Keep at least six together and they direct most of their energy at each other in normal chasing and sparring, which actually looks quite natural and lively in a spacious tank. Check out real community builds featuring rosy barbs to get a sense of how good they look in a well-planted setup.
Water Parameters
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GH
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Flow Preference
Keeping multiple Rosy Barb together
Rosy Barb 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
Good tankmates need to be robust enough to handle the pace. Other active mid-water fish like danios, larger rasboras, and other medium barbs work well. Corydoras and loaches on the bottom generally get ignored. Avoid anything with flowing fins like bettas, guppies, or angelfish, since rosy barbs will absolutely shred those. Dwarf cichlids can sometimes coexist in larger tanks but it's a gamble. Shrimp of any size are at risk and not a good combination. In tanks above 150 liters the dynamics get much easier and more species become viable neighbors.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The biggest beginner mistake is housing these in a tank built for smaller barbs. At 10cm fully grown, a group of six needs real space or aggression and stress climb fast. Undersized groups in small tanks are the most common failure mode. Plants with soft or delicate leaves often get shredded, especially if the fish aren't getting enough plant matter in their diet. Supplementing with blanched spinach or zucchini helps redirect that behavior. Water quality is forgiving but these fish are active and eat a lot, so don't underestimate the filtration requirements for a proper group.
Behavior & Aggression
Rosy barbs are not aggressive in the predatory sense, but they are boisterous and relentless. The main issue is fin nipping, which tends to emerge when the group is too small, the tank is too cramped, or slower long-finned fish share the space. A school of six or more in a properly sized tank channels most of that energy inward, with males chasing each other and displaying constantly. Females aren't immune to male harassment during breeding, so having more females than males in the group helps. They don't typically bother short-finned, similarly sized tankmates.
Things to Know
- Can reach 10cm, much larger than most beginners expect from a 'barb'
- Will eat shrimp, including larger ornamental species
- Males intensify color dramatically when breeding, may chase females relentlessly
- Keep in groups of 6+ or fin nipping and chasing increases significantly
- Keep in schools of 6+ to reduce nipping and stress.
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