Luapula elephantfish

Where they come from

Luapula elephantfish (Campylomormyrus luapulaensis) are mormyrids from the Luapula River system in central Africa, tied into the Congo basin. Think tea-stained water, lots of tangled roots, soft bottoms, and low light. They are built for feeling their way around more than watching everything like a cichlid does.

They use a weak electric field to navigate and hunt. That is not just a fun fact - it drives almost every choice you make in the tank.

Setting up their tank

If you have never kept an elephantfish, plan the tank around calm, dark, clean water and lots of hiding spots. These fish settle in way faster when they can disappear whenever they want.

• Tank size: I would not bother under 75 gallons for a single adult. Bigger is easier because they spook less and you can build more cover.
• Substrate: fine sand. They probe and nose around, and coarse gravel leads to damaged snouts and stress.
• Lighting: dim. Floating plants, tinted water (catappa leaves, alder cones), and shaded areas help a lot.
• Hardscape: smooth driftwood, root tangles, and caves with wide entrances. Give them routes, not dead ends.
• Flow and filtration: moderate flow, strong biofiltration. They like clean water but not a river torrent.
• Cover: a tight lid. They can jump when startled, especially the first month.

Water chemistry does not need to be weird, but it needs to be stable. Soft to moderately hard is fine. Slightly acidic to neutral is where I have had the easiest time getting them to eat and relax. What matters more is low nitrate and lots of oxygen.

• Temperature: 25-28 C (77-82 F)
• pH: roughly 6.0-7.5
• Hardness: soft to medium (they adapt, but avoid extremes)
• Nitrate: keep it low. I try to stay under 20 ppm, lower if you can.

One more thing people miss: electrical noise. Mormyrids read the world through their electric sense, and some equipment can make them act weird. Most modern heaters and filters are fine, but if your fish is constantly twitchy, hiding 24/7, or refusing food, try changing one device at a time (heater first is a common culprit) and check for stray voltage.

What to feed them

They are predators and picky in that classic elephantfish way. Mine rarely cared about flakes or pellets. They want meaty, sinky food they can sniff out.

• Staples: earthworms (chopped), blackworms, live or frozen bloodworms, tubifex (from a trusted source), mysis, chopped shrimp
• Good extras: small pieces of fish or clam, insect larvae
• Training foods: sinking carnivore pellets can work, but you usually have to mix them into frozen foods and be patient

I like to target feed with long tweezers or a turkey baster. You will learn their routine fast - they start cruising the bottom once they know food is coming. Smaller meals more often works better than one giant dump, especially while they are new and skittish.

How they behave and who they get along with

This is an expert fish mostly because of behavior. They are not aggressive like a piranha, but they can be territorial, especially toward other mormyrids. They also stress easily if the tank is loud, bright, or crowded.

With their own kind, things depend on space and layout. In a big tank with loads of cover, you can sometimes keep multiple, but you need to be ready to separate if one starts bullying. Chasing at night, blocked hiding spots, and ripped fins are your cues.

• Good tankmates: calm midwater fish that will not steal all the food (larger tetras, Congo tetras in big tanks, peaceful barbs), mellow catfish that keep to themselves (some Synodontis can work if not too pushy)
• Avoid: fin nippers, hyperactive fish, aggressive cichlids, anything that outcompetes them at feeding time, and other electric fish unless you really know what you are doing
• Also avoid: tiny fish and shrimp if you are attached to them. If it fits in the mouth, it is on the menu eventually.

They are mostly crepuscular to nocturnal. If you never see yours, do not assume it is unhappy. Check that it is eating, then let it be a weird little submarine in the shadows.

Breeding tips

Breeding Campylomormyrus in home aquariums is rare. Most of what you see for sale are wild-caught. In the wild, many mormyrids tie spawning to seasonal changes (rising water, big influx of fresh food, shifting conductivity). Recreating that whole pattern in a glass box is the hard part.

If you want to try, think in terms of simulating a rainy season, not just turning the heater up.

• Start with a well-conditioned group in a very large tank with lots of cover
• Heavy feeding on live/frozen foods for weeks to build condition
• Gradual changes: slightly cooler, then warmer again with bigger, softer water changes to mimic fresh rain
• More flow and oxygen during the "rainy" phase
• Fine-leaved plants or spawning mops in sheltered areas (some species scatter eggs)

Common problems to watch for

Most issues I have seen come down to stress, starvation, or water quality. They are tough once settled, but the first month can be rocky.

• Not eating: usually too bright, too busy, or food choice is wrong. Darken the tank, feed at night, and offer worms.
• Skin damage and snout injuries: sharp decor, rough substrate, or panicked dashes. Switch to sand and smooth wood/rocks.
• Ich and other parasites: wild-caught fish can arrive with hitchhikers. Quarantine if you can, and treat gently (they can be sensitive).
• Stray voltage/equipment noise: odd twitching, constant hiding, frantic behavior. Test for voltage and swap suspect heaters.
• Bloat/constipation: overfeeding rich foods. Give smaller meals, rotate foods, and keep temperatures steady.
• Bullying: especially from other mormyrids or pushy catfish. Rearrange decor, add more hides, or separate.

If you get one that is eating well and feels safe, you will see a totally different fish - out cruising, confidently probing the sand, and acting like it owns the night shift. Getting them to that point is the whole game.