Kamdem's killifish

Where they come from

Fundulopanchax kamdemi is one of those West African killifish that looks like it was painted on purpose. They come from Cameroon, in small forest streams and swampy areas where the water is usually soft, a bit acidic, and full of leaf litter.

That background matters because they are at their best in a tank that feels a little "shady" and cluttered, not bright and sterile.

Setting up their tank

For a pair or trio, a 10-15 gallon works well. Bigger is always nicer, but what they really want is cover and calm water.

• Tank size: 10+ gallons for a pair/trio, 20+ if you want a small group
• Filtration: gentle sponge filter or a baffled hang-on-back (they do not love being blasted around)
• Lighting: moderate to low; floating plants help a lot
• Cover: dense plants (especially near the surface), wood, and leaf litter style decor if you like that look
• Substrate: anything works, but darker substrates make their colors pop and keeps them calmer

Water-wise, I keep them in the mid-70s F and they are happy. Soft to moderately hard is usually fine if you keep things stable, but they really show better colors and breed more willingly in softer, slightly acidic water.

Feeding

These are classic "micro-predator" killifish. They will take flakes and small pellets eventually, but they really come alive on frozen and live foods.

• Great staples: frozen bloodworms, brine shrimp, daphnia, cyclops
• Live foods (if you can): baby brine shrimp, grindal worms, mosquito larvae (from safe sources)
• Dry foods: small pellets/crumbles, high-protein flakes (use as backup, not the whole diet)

I feed small amounts once or twice a day. They have that killifish habit of acting starving even when they are not, so try not to overdo it.

Behavior and tankmates

F. kamdemi is confident but not a total terror. Males posture and flare a lot, and in tight tanks they can ride each other pretty hard. Give them line-of-sight breaks (plants, wood) and you will see more displaying and less chasing.

• Best setup: one male with 1-2 females, or a larger tank with multiple females per male
• Temperament: active, curious, can be pushy with other surface fish
• Where they hang out: top and midwater, especially near plant cover

Tankmates are doable, but choose carefully. They are fast, they like the surface, and anything small enough can look like food. I have had the best luck pairing them with calm, non-nippy fish that stay out of their lane.

• Usually works: small peaceful tetras, pencilfish, small rasboras, Corydoras, small peaceful loaches
• Avoid: fin nippers (serpaes, some barbs), hyperactive fish that own the surface, aggressive dwarfs, and tiny shrimp/fry you want to keep
• Shrimp note: adult shrimp might survive in heavy cover, but shrimplets are basically snacks

Breeding tips

They are egg layers and will spawn regularly once settled. The easiest way is to give them a spawning mop (acrylic yarn mop) or fine-leaved plants, then collect eggs.

• Breeding group: 1 male with 2-3 females reduces stress on any one female
• Spawning site: floating mop is my go-to; a bottom mop works too
• Conditioning: heavy frozen/live foods for a week or two
• Egg collection: check mops daily or every couple of days and pull eggs into a small container

Incubation depends on temperature, but think roughly 2-3 weeks as a starting point. Keep the eggs in clean water with a drop or two of methylene blue if you fight fungus, or just keep them well-aerated and remove any white eggs quickly.

Fry are small and need tiny foods early on. I start with infusoria or commercial fry dust for a couple days, then move to baby brine shrimp as soon as they can take it. Once they hit BBS, growth gets much easier.

Common problems to watch for

• Jumping: the number one cause of "mystery disappearances" - lid everything
• Bloat/constipation: usually from too much rich food; fast them a day and switch to daphnia/brine shrimp
• Fungus on eggs: common if eggs sit in dirty or still water; pull bad eggs and add gentle aeration
• Male aggression: shows up in small tanks or sparse decor; add cover or reduce to one male
• Skinny fish that will not gain weight: often internal parasites in new imports; quarantine and consider deworming if needed
• Spooking and glass surfing: bright lights and no cover; add floaters and break up sight lines

If you keep the tank covered, feed them a varied diet, and give them plants up top, they are pretty forgiving for an intermediate fish. Most "issues" I see with kamdemi are really just too much flow, too much light, or not enough cover.