Dolphin barb

Where they come from

Dolphin barbs (Incisilabeo behri) are river fish from Southeast Asia, showing up in fast, rocky streams with cool, clear water and loads of oxygen. Think boulder gardens, strong current, and algae-coated stones. Their mouth shape is built for scraping biofilm, not chasing food in still water.

Setting up their tank

Give them a long tank and real flow. A 4-foot footprint is the starting point for a small group, and longer is better. They are busy swimmers and will pace if they feel cramped. Heavy aeration is non-negotiable with this species.

• Filtration: big canister or a pair of HOBs plus a prefilter sponge. Aim for high turnover.
• Current: powerheads or a river-manifold setup so one end is a jet and the other a calmer return.
• Oxygen: multiple air stones or venturi on the powerheads.
• Substrate and decor: sand or fine gravel, plus rounded cobbles and river stones. Avoid sharp edges that can scrape their lips.
• Plants: optional. Tough epiphytes (Anubias, Bolbitis, Java fern) tied to rocks handle the flow. Expect some nibbling.

They come from cooler water than typical tropical barbs. I keep them roughly 20-24 C (68-75 F), pH around neutral, and moderate hardness. Big weekly water changes keep them perky, and they appreciate slightly tannin-stained but clear water.

What to feed them

They are grazers first, predators second. Think plant-heavy diet with regular access to biofilm. If you feed them like typical barbs, they get pudgy and run into gut issues.

• Staples: spirulina wafers, veggie-based sinking pellets, Repashy Soilent Green or Super Green, blanched zucchini, spinach, or peas.
• Foraging: rotate in algae-covered stones and driftwood. They will spend hours working them over.
• Treats 2-3x per week: small frozen foods (daphnia, cyclops, baby brine). Keep it light on bloodworms.
• Feeding pattern: smaller portions 2-3 times daily beats one big dump of food.

How they behave and who they get along with

They are active, pushy barbs with a clear pecking order. Kept alone, one fish can turn into a bully. In a proper group, the squabbles spread out and stay harmless. I like 6+ if the tank size allows.

• Good company: other fast-water fish that enjoy current and cooler temps - danios (Devario, Danio), hillstream loaches (Sewellia, Gastromyzon), Garra, balitorid loaches, robust rasboras.
• Use caution: slow or long-finned fish (gouramis, fancy guppies), delicate shrimp, or territorial cichlids.
• Layout helps: break line of sight with rock piles so subdominant fish can get a breather.

Breeding tips

They are rarely bred in home aquariums. Think seasonal river spawners. If you want to try, you need space, strong flow, and patience. Most reports suggest they scatter eggs in fast water and do not guard them.

• Condition a group on heavy greens and small live foods for a few weeks.
• Simulate a monsoon: a period of cooler, softer water changes, followed by a gradual warm-up and increased flow.
• Add spawning grids or yarn mops in the high-flow lane so eggs can drop out of reach.
• If you spot spawning chases, pull the adults right after. Eggs and fry get eaten instantly.
• Early fry need infusoria and fine powdered foods, then move to baby brine. Strong current is still needed, but give them calmer eddies to rest.

Common problems to watch for

• Oxygen debt: they arrive stressed and can crash in low O2. Run extra air and surface agitation, especially right after introduction.
• Starvation in new tanks: spotless, algae-free displays look nice but do them no favors. Provide biofilm or veggie-heavy foods from day one.
• Mouth and lip wear: sharp decor or constant glass-pacing rubs their snouts. Use rounded stones and break up reflections.
• Bloat from rich diets: dial back meaty foods and fast a day each week.
• Ich after temperature swings: treat gently, raise aeration during meds, and avoid heavy copper with this group.
• Jumping: any sudden shadow or knock on the glass can send them airborne. Lid stays on.