Distichodus brevipinnis

Where they come from

Shortfin distichodus (Distichodus brevipinnis) is a big African river fish. You mostly see them associated with the Congo basin trade, and that matches how they act in the tank: built to cruise, built to eat, and built to mow through plants if you let them.

They are not rare because they are delicate. They are rare because most people underestimate how large and strong they get, then run out of aquarium.

Setting up their tank

Plan the tank around adult size and attitude, not the cute 3-4 inch juvenile in the shop. These are high-output, fast-swimming fish that can hit 10-12 inches (sometimes more) and get thick-bodied. A long tank beats a tall tank every time.

• Tank size: I would not do less than 180 gallons for a single adult, and 240+ is more realistic if you want tankmates.
• Footprint: aim for 6 feet of length if you can. They use every inch.
• Filtration: big canister(s) or sump with strong mechanical filtration. They are messy eaters.
• Flow and oxygen: moderate to strong flow plus a lot of surface agitation. They appreciate well-oxygenated water.
• Cover: driftwood, big rocks, and tough plants only if you do not mind them being sampled. Give them sight breaks so they are not constantly squaring up with tankmates.
• Substrate: sand or smooth gravel. They can spook and bolt, so skip sharp stuff.

For water parameters, do not chase a magic number. Clean, stable freshwater is what makes them settle. Neutral-ish pH and typical tropical temps are fine (roughly mid 70s to around 80F). What they do not tolerate well is dirty water and neglected filters.

What to feed them

They are basically a vegetarian-leaning omnivore with a serious appetite. In my experience, a distichodus that is not getting enough plant matter will go on a mission to redesign your aquascape (and it will not ask permission).

• Staples: high-quality herbivore/spirulina pellets, quality flakes for variety, and some larger sinking pellets as they grow.
• Greens: blanched zucchini, cucumber, romaine, spinach, green beans. Clip it in so they can graze.
• Extras: peas (shelled), nori sheets, and occasional frozen foods like bloodworms or brine shrimp as a treat, not the main diet.
• Wood and fiber: they will pick at driftwood and biofilm. That is normal.

If you see them getting hollow-bellied or stringy poop, back off rich foods and increase greens and fiber. These fish can handle a big diet, but their gut seems happier when you keep plant matter in the mix.

How they behave and who they get along with

They are active, bold, and sometimes pushy. Not usually a fin-nipper like some barbs, but they will shoulder-check fish that get in their way, and they can be territorial once established.

Juveniles can be jumpy and skittish. Adults tend to act like they own the place. Expect them to claim favorite cruising lanes and feeding spots.

• Good tankmates: other robust, similarly sized fish that can handle movement and occasional attitude (large African cichlids with compatible temps, big barbs, some larger catfish).
• Use caution: slow, long-finned fish (they get stressed and sometimes get harassed), very plant-reliant aquascapes, and delicate species that do not compete well at feeding time.
• Avoid: anything small enough to be swallowed, and peaceful community fish. Also avoid mixing with very aggressive bruisers that will constantly batter them.

Keeping more than one can work, but it is not a guaranteed peaceful shoal situation in a home tank. In big setups, a group can spread out aggression, but in medium-large tanks you sometimes end up with one bully. Have a plan to separate if it goes sideways.

Breeding tips

Breeding Distichodus brevipinnis in home aquariums is not common. Most of what we see in the hobby are wild-caught or commercial-farm fish, and spawning usually needs space, seasonal cues, and a conditioned group.

If you want to try, think in terms of a big group, very heavy feeding with greens, and big water changes that mimic rainy season (slightly cooler water and lots of fresh water). Even then, do not be surprised if nothing happens. If they do spawn, eggs and fry are likely at risk from the adults, so you would need a way to remove eggs or move the adults quickly.

Common problems to watch for

• Plant destruction: even "safe" plants get shredded or uprooted. If you want greenery, go with tough stuff (Anubias, Java fern on wood/rock) and accept some damage.
• Rapid nitrate creep: big eater plus big poop. Test water, clean mechanical media often, and keep up with water changes.
• Bloat/constipation: usually from too much rich food and not enough fiber. Increase greens, add peas, and avoid overfeeding.
• Stress from cramped quarters: pacing, skittishness, and constant sparring often trace back to not enough length and not enough sight breaks.
• Ich and other parasites: wild fish can bring hitchhikers. Quarantine if you can, and do not crank temps blindly - focus on stable water and appropriate treatment.
• Injuries from spooking: they bolt. Sharp rocks, rough wood, and unsecured lids turn that into lost scales or worse.

If you keep the water clean, feed them like a veggie-powered athlete, and give them room to cruise, they are tough fish. The hard part is meeting their size and messiness with a setup that can keep up.