Ruaha shellear

Where they come from

Ruaha shellear (Kneria ruaha) is one of those oddball African river fishes that makes you look twice. They come from the Ruaha River system in Tanzania, so think moving water, lots of oxygen, and a life spent picking at tiny food drifting past.

They are not common in the hobby, and a lot of what people struggle with is treating them like generic community fish. They are much more of a river specialist.

Setting up their tank

If you want these to do well, build the tank around flow and oxygen. Mine looked best and acted the most confident in a long tank with a clear current they could sit in and out of, kind of like little river darts.

• Tank size: I would not bother under 20 gallons long, and bigger is easier because water stays stable.
• Filtration: strong filtration plus extra aeration. A canister with a spray bar or river-manifold style flow works well.
• Flow: give them a steady lane of current, but also calmer eddies behind rocks and wood so they can rest.
• Substrate: sand or fine gravel. They do a lot of close-to-the-bottom foraging and you do not want sharp stuff.
• Hardscape: rounded river stones, some driftwood, and clumps of plants (or tough epiphytes) in the calmer zones.
• Lighting: moderate is fine. They do not need a spotlight, they need stable water.

For parameters, I have kept them in neutral-ish water without drama. Aim for stable and clean rather than chasing a magic number. What they hate is swings, mulm buildup, and a tank that feels stuffy.

What to feed them

These are small-food fish. In my tanks they spent the day picking and snapping at tiny bits, not bulldozing big pellets. If you feed like you would for barbs or cichlids, they can slowly fade because they just are not built to compete.

• Staples: small sinking micro-pellets, crushed flakes, and fine granules that drift a bit in the current.
• Frozen: cyclops, daphnia, baby brine shrimp, finely chopped bloodworms (not as the only food).
• Live (if you can): grindal worms, microworms, newly hatched brine shrimp, small daphnia.

If you have other fish in the tank, use the current to your advantage. Drop food upstream so it tumbles past them, and also target-feed a little into the quieter pockets where they like to hover.

How they behave and who they get along with

They are not nasty fish, but they are a bit high-strung at first. Once settled, they spend a lot of time facing into the flow and making quick little dashes to grab food. A group is way better than a single fish, both for confidence and for seeing natural behavior.

• Best kept: in a small group (I like 6+ if the tank size allows).
• Good tankmates: other peaceful river fish that will not outcompete them at every meal (small rheophilic cyprinids, calm loaches, similar-sized non-bullying fish).
• Avoid: aggressive fish, fast piggy eaters, fin nippers, and anything big enough to treat them as snacks.

Breeding tips

Breeding Kneria in home aquariums is not something you see every day. I have not had consistent spawns, but I have seen behavior that looked like conditioning and chasing when the group was well-fed and the water was very fresh.

If you want to take a run at it, think like a small river spawner: lots of tiny live foods, heavy oxygenation, and regular cool-ish water changes to imitate new water coming in.

• Use a group, not a pair. Let them sort themselves out.
• Provide spawning media: fine-leaved plants, moss, or a layer of smooth pebbles where eggs can fall out of reach.
• Condition with small live and frozen foods for a couple weeks.
• Do frequent water changes and keep the tank spotless.
• If you see egg scattering behavior, consider moving adults out or using a breeder-style setup so eggs do not get eaten.

Common problems to watch for

Most losses I have seen (mine and other hobbyists) trace back to the same themes: not enough oxygen, not enough small food, and stress from tankmates or unstable water.

• Rapid breathing or hanging near the surface: usually an oxygen or temperature issue. Add aeration and check for clogged filter media.
• Slow weight loss: they are getting outcompeted or the food is too big. Switch to micro foods and feed smaller portions more often.
• Hiding all the time: too bright, too little cover, too much chaos from other fish, or not enough of their own kind.
• Sudden deaths after maintenance: big parameter swings or stirring up gunk. Do smaller water changes more often and avoid blasting mulm into the water column.

Quarantine is worth your time with this species. Wild fish can come in thin, and they do not handle rough medication routines well. I keep it gentle: clean water, high oxygen, lots of small foods, and only medicate if I actually see a clear problem.