Amphilius dimonikensis

Where they come from

Amphilius dimonikensis is a small African mountain catfish from fast, cool, rocky streams in the Congo Basin. Think clear water pushing over stones, leaf litter tucked in the margins, and tons of oxygen. That stream vibe is your blueprint for the tank.

Setting up their tank

Give them footprint and flow more than height. A 24-30 inch long tank (20-30 gallons) works well for a small group. They like to sit in current and dart between rocks, so build lanes of flow and pockets of calm.

• Filtration and flow: Aim for 10-15x turnover. A canister with a spray bar plus a powerhead works great. Add a big airstone or venturi for extra oxygen.
• Substrate: Smooth sand or fine rounded gravel. Skip sharp pebbles that chew up barbels and bellies.
• Hardscape: Stacks of rounded river stones, cobbles, and a few tight caves. A little driftwood and some leaf litter give them cover and microfauna.
• Lighting: On the dim side. They appreciate shade and will venture out more with subdued light.
• Water: Cool and clean. 18-23 C (64-73 F), pH 6.2-7.2, soft to moderately hard. Keep nitrate low. Do 30-50% weekly water changes.
• Flow map: Strong current across the front or along one side, with eddies behind rocks so they can rest.

What to feed them

They are micro-predators that hunt along the bottom and in the current. New arrivals usually ignore flakes and big pellets, but they wake up for moving foods.

• Live or frozen: blackworms, bloodworms, daphnia, baby brine shrimp, mosquito larvae.
• Prepared: small sinking carnivore pellets, high-quality micro pellets, and soft gel foods (Repashy-style) pressed onto stones.
• Occasional treats: chopped earthworm or tubifex kept clean.

Feed small amounts 1-2 times daily. They get bold at dusk, so an evening feed works well. Let the current carry food across the rocks so they can pounce.

How they behave and who they get along with

Quiet, crepuscular, and very focused on the bottom. They are not bullies, but they can be shy if the tank is too bright or busy. I get the best behavior in small groups of 4-6 so they are not constantly hiding.

• Good neighbors: small, peaceful stream fish that like similar temps and flow. Think small African barbs (Enteromius species), lampeyes, or even cool-water rasboras and danios.
• Also fine: hillstream loaches and smaller Garra if there are plenty of hides.
• Avoid: large or boisterous cichlids, fin-nippers, and anything that outcompetes them at feeding time.

Breeding tips

Home breeding is rare, but they likely scatter eggs in current under stones during a cool, rainy-season surge. If you want to give it a shot, think seasonality and strong flow.

• Set up a dedicated stream tank with piles of smooth pebbles and a mesh grate under a rock pile so eggs can drop out of reach.
• Run very high oxygen and brisk current. Keep temps on the low side (18-20 C / 64-68 F).
• Condition heavily with live foods for a few weeks.
• Do several larger, slightly cooler water changes to mimic rains.
• Dim the lights and leave them alone. If spawning happens, pull the adults or lift the rock pile to harvest eggs.

Common problems to watch for

• Low oxygen or high temps: first sign is rapid breathing and hanging at the surface or in the blast of the filter. Add air and drop the temp with a fan.
• Barbel erosion: usually from sharp substrate, dirty gravel, or high nitrates. Swap to sand, vacuum regularly, and increase water changes.
• Scrapes and fungus: they wedge into tight gaps. Use smooth stones and round off any sharp edges.
• Internal parasites: a thin, picky fish with white stringy poop likely needs a dewormer. Treat in quarantine with good aeration.
• Medication sensitivity: scale-less catfish often react badly to copper and some dyes. Start with half-doses, blast the tank with extra air, and monitor closely.
• Feeding competition: fast midwater fish can steal everything. Target feed with a turkey baster into the flow and feed after lights out.