Austellus barb

Where they come from

Dawkinsia austellus (often called the Austellus barb) is one of those South Indian river barbs that looks like it was designed to be in a moving, sunlit stream. They come from the Western Ghats region, where you get clear-ish water, seasonal changes, and lots of leaf litter and overhanging plants along the edges.

That background explains most of what they like in the aquarium: room to cruise, some current, and a setup that feels like a riverbank rather than a bare glass box.

Setting up their tank

Give them space first, then decorate. These are active barbs that spend a lot of time midwater, and they look their best when they can school and make laps.

• Tank size: I would not bother with less than a 30 gallon for a group. A 40 breeder footprint is even nicer.
• Group size: 8-12 is where they settle down and act like a school instead of a few fish picking on each other.
• Flow and oxygen: moderate flow and good surface movement. They are not hillstream fish, but they appreciate fresh water.
• Hardscape: smooth stones, some driftwood, leaf litter if you like that look (and your filter can handle it).
• Plants: tougher plants or plants along the edges. They will not usually shred plants, but they can bulldoze delicate stems when they get excited.
• Lighting: medium light works. Floating plants help calm them down if the tank feels too bright.

For water numbers, they are pretty flexible as long as you keep things stable and clean. Neutral-ish water is fine. I have kept similar Dawkinsia in slightly soft to moderately hard water without drama. What they do not love is old, dirty water and a tank that swings all over the place.

What to feed them

They are easy to feed, but they color up and behave better with variety. Think of them as little omnivorous grazers that also love small meaty stuff.

• Staple: a good quality flake or small pellet that is not all filler
• Meaty foods: frozen cyclops, daphnia, brine shrimp, bloodworms (as a treat, not daily)
• Plant matter: spirulina flake, blanched spinach, shelled peas (great if anyone looks a bit backed up)
• Live foods (if you can): live daphnia or baby brine shrimp gets them really fired up

How they behave and who they get along with

In a good-sized group, they are busy, social, and fun to watch. You will see little sparring displays, quick chases, and then everyone goes back to schooling like nothing happened.

If you keep too few, the bossy ones focus on one or two fish and it gets ugly. This is one of those species where "just get a pair" is a recipe for stress.

• Good tankmates: other peaceful midwater fish that can handle some activity (danios, larger rasboras), peaceful bottom fish (Corydoras, loaches that are not pushy), and sturdy gouramis if the tank is big enough
• Use caution: slow long-finned fish (fancy guppies, veil tails). Some groups ignore fins, some groups absolutely do not.
• Not a great match: very timid fish that hate commotion, or aggressive fish that will treat them like snacks or punching bags

Breeding tips

They are egg scatterers. If you have both sexes and you feed heavy on live/frozen foods, you may see spawning behavior in the main tank, especially after a big water change. The problem is the eggs do not last long around hungry adults.

• Conditioning: run them on good food for 1-2 weeks (daphnia and brine shrimp are my go-tos)
• Spawning setup: a separate tank with a sponge filter and either a thick mat of java moss or a spawning mop
• Trigger: a slightly cooler water change in the evening often gets action the next morning
• After spawning: pull the adults right away if you want fry
• Fry food: start with infusoria or powdered fry food, then baby brine shrimp as soon as they can take it

Common problems to watch for

Most of the issues I see with these are the same stuff that hits active schooling fish in general: stress from small groups, water quality slipping, and the classic "ate too much" belly problem.

• Fin nipping and chasing: usually too few fish, too small a tank, or not enough breaks in the decor
• Ich and other spotty stress diseases: often shows up after shipping or big temperature swings
• Bloat/constipation: from overfeeding rich foods or feeding only dry food
• Jumping: they can launch when spooked, especially in new tanks
• Wasting/skinny fish: can be internal parasites, especially in new imports

My routine that keeps them looking good is pretty simple: steady temperature, regular water changes, and not letting the filter get neglected. If a fish starts isolating, clamping fins, or breathing fast, I treat that as a "check the basics" moment first: ammonia/nitrite, nitrate, temperature, and whether someone is getting bullied.