Rosy Tetra
Hyphessobrycon bentosi
Rosy Tetras exhibit a striking pink to orange hue, with a distinctive black spot near the base of the adipose fin and a slender, streamlined body.
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About the Rosy Tetra
Rosy tetras are those little coppery-pink characins that look kinda "glowy" when the light hits them right, and the males can get nice extended fins when they're settled in. Keep a small group and you'll see them do their little pecking-order sparring and flashing-nothing scary, just classic tetra drama that looks awesome in a planted tank.
Also known as
Quick Facts
Size
2.5 inches
Temperament
Peaceful
Difficulty
Beginner
Min Tank Size
20 gallons
Lifespan
3-5 years
Origin
South America
Diet
Omnivore - quality flakes/micro pellets, plus frozen/live foods like brine shrimp, daphnia, and bloodworms
Care Notes
- Keep rosy tetras in a group of at least 6-8; if you only buy a couple they get skittish and can get nippy with each other.
- A 20-gallon long is a comfy starting size for a proper school-give them open swimming space with plants/wood around the edges for cover.
- They're pretty forgiving, but they look and act best around 74-80°F, pH ~6.0-7.5, and low-to-moderate hardness; avoid big swings more than chasing a "perfect" number.
- Feed small portions once or twice a day: a decent flake/micro pellet as the base, plus frozen foods like brine shrimp, daphnia, or bloodworms a few times a week to boost color.
- Good tankmates: other peaceful community fish (corys, small rasboras, peaceful dwarf cichlids, most small tetras); skip finny slowpokes like bettas, fancy guppies, and long-finned gouramis if you notice any fin-testing.
- Dimmer light and some floating plants make them way bolder and brings out that rosy red; they can look washed out in a bright, bare tank.
- Watch for "mystery" losses from old-age/weak imports-buy active fish with full bellies, and quarantine if you can because ich shows up fast on new tetras.
Compatibility
Good Tankmates
- Other chill midwater schoolers like ember tetras, neon tetras, glowlight tetras-rosies are pretty easygoing in a mixed tetra crowd (best when everyone's in decent-sized groups).
- Corydoras catfish (any of the common cories). They stay on the bottom, mind their business, and the rosies don't bother them at all.
- Small peaceful rasboras (harlequins, espei/lambchops). Same vibe, same general pace, no drama.
- Dwarf cichlids with a calm personality, like apistogramma or bolivian rams-works well if the tank has plants/hides and you're not cramming them in during spawning.
- Peaceful bottom crews like kuhli loaches or a bristlenose pleco-good for filling out the lower levels without stressing the rosies.
- Honey gourami (or other mild gouramis). Rosy tetras usually ignore them, especially if the tetras are in a proper school and not bored.
Avoid
- Fin-nippers and semi-aggressive stuff like tiger barbs (and a lot of barbs in general). They'll turn the tank into a constant chase scene and stress the rosies out.
- Big or pushy cichlids (convicts, most Africans, larger Central/South Americans). Rosies are peaceful and just end up as targets or snacks.
- Slow fish with fancy fins like bettas or long-finned guppies-rosies aren't the worst, but they can get curious and start picking when the fins are waving around.
1) Where they come from
Rosy tetras (Hyphessobrycon bentosi) come from the Amazon basin region—slow, plant-choked waters with leaf litter and tannins. That’s why they look so good over dark substrate with a bit of “tea-colored” water. In shops you’ll usually see tank-bred fish, but they still appreciate that calm, soft-ish vibe.
2) Setting up their tank
These are beginner-friendly fish, but they do best in a tank that isn’t bare and bright. Give them some plants, some shade, and room to cruise in the middle of the tank. Once they settle in, they really show off that rosy body and the longer fins on the males.
- Tank size: I’d start at 15–20 gallons for a proper group (they look way better in numbers).
- Group size: 8+ is the sweet spot. Fewer than that and they get a bit nippy or shy.
- Filtration: gentle-to-moderate flow. They’re not built for a river-tank blast.
- Scape: plants (real or fake), driftwood, and a little open swimming lane in the front.
- Lighting: not too intense; floating plants help a lot.
If you want instant “Amazon vibes,” toss in a couple catappa (Indian almond) leaves or a small bag of peat in the filter. Not mandatory, but they color up nicely and seem less jumpy.
Water numbers don’t need to be a science project. Neutral-ish water is fine for most tank-bred rosies. Stable temperature and clean water matter more than chasing a perfect pH.
- Temperature: 74–80°F (23–27°C)
- pH: roughly 6.0–7.5 (they’re flexible if it’s stable)
- Hardness: soft to moderate is easiest
- Maintenance: weekly water changes are your best friend, especially in smaller tanks
3) What to feed them
Rosy tetras aren’t picky, which is part of their charm. A decent flake or micro pellet as the staple works, and then you rotate in some frozen/live foods and they really start looking “awake.”
- Staple: quality flake or small pellets (they have small mouths)
- Frozen: brine shrimp, daphnia, cyclops, bloodworms (bloodworms as a treat, not every day)
- Live (if you do it): baby brine shrimp, grindal worms, daphnia
- Extras: crushed flakes for younger/smaller fish
Feed small amounts 1–2 times a day. If you see food drifting to the bottom untouched, you’re overdoing it—rosies eat fast when they’re comfortable.
4) Behavior and tankmates
They’re classic “community tetra” energy: active, curious, and usually peaceful. The one thing people get surprised by is fin-nipping—rosies can do it, especially in small groups or cramped tanks.
- Temperament: peaceful, but can get a bit mouthy with long fins
- Swimming zone: mostly mid-water
- Best look: a bigger group in a planted tank—more schooling, less drama
Good tankmates are other calm community fish that like similar temps and won’t be stressed by a busy tetra group.
- Good picks: corydoras, small/medium rasboras, other peaceful tetras, dwarf gourami (watch personalities), otocinclus, bristlenose pleco (in bigger tanks)
- Use caution: guppies and fancy long-finned fish (tempting targets), slow bettas, angelfish with flowing fins in smaller setups
If you see fin nips: first add more rosies (bigger group), then look at tank size/line-of-sight cover. It’s usually a “not enough shoal / not enough space” problem.
5) Breeding tips
Breeding rosy tetras is totally doable if you’re curious, but they won’t raise the babies for you. They scatter eggs and will snack on them like it’s a buffet. If you want fry, you need a simple breeding setup.
- Breeding tank: 5–10 gallons, sponge filter, heater
- Egg protection: spawning mop or dense plants (java moss), or a mesh/marbles layer so adults can’t reach the eggs
- Parents: a conditioned pair or small group (feed frozen/live for a week)
- Lighting: dim helps; they often spawn early morning
Once you see spawning behavior (chasing and quivering in plants/mop), pull the adults the same day. Eggs hatch in about a day or so depending on temperature. Fry are tiny—think infusoria or powdered fry food at first, then baby brine shrimp once they can take it.
If you’re not getting eggs, try softer water and a slightly cooler water change followed by warming back up—kind of a “rainy season” trick.
6) Common problems to watch for
Rosy tetras are hardy, but they still get the usual community-fish issues. Most problems I’ve seen trace back to new tank syndrome, stress from being kept in too small a group, or water that’s getting dirty between changes.
- Fin nipping: usually small group size, cramped tank, or too-bright/bare setup
- Ich after buying: common if the store tanks are mixed; quarantine helps a ton
- Faded color / clamped fins: stress, temp swings, or water quality slipping
- Bloat/constipation: too many rich foods; add daphnia and ease up on feeding
- Sudden losses in a new tank: cycling issue—ammonia/nitrite are the silent killers
They don’t love sharp swings. Keep temperature steady, don’t skip maintenance for weeks, and acclimate new fish slowly—especially if your tap water is very different from the store’s.
If you keep them in a decent-sized group, give them plant cover, and stick to a simple feeding routine, rosy tetras are one of those fish that make your tank look “alive” all day long.
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