Papilio cichlid

Where they come from

Xenotilapia papilio is a Tanganyika fish, and it acts like one the second you get it home. In the lake they hang around sandy areas with rock piles nearby, constantly picking at the bottom for tiny food. The "papilio" name fits - the fins and the way they hover and flutter over the sand is half the appeal.

They are not a "dump them in a community tank" cichlid. They are more like a fussy little sand-sifter that wants stable water, calm tankmates, and room to do their thing.

Setting up their tank

Think sand first, rocks second. These fish live with their face in the substrate, and you will see way more natural behavior if you give them a big open sandy run with a few rock islands.

• Tank size: I would not do them in anything under a 36 in footprint. A 40 breeder style footprint is great. Bigger is easier because you can spread territories out.
• Substrate: fine sand. Not gravel. They sift, and gravel just frustrates them and can mess up their mouth.
• Hardscape: a couple of rock piles (stable, on the glass or eggcrate, then sand around them). Leave open sand in front.
• Filtration: strong, steady, and quiet. They like clean water but not a constant sandstorm.
• Lighting: whatever you like. They do not need bright plant lighting. They look good under neutral to slightly warm light.

For water, aim for Tanganyika-style: hard, alkaline, and stable. I keep them around the mid-to-high 70s F. Stability matters more than chasing a magic number. Weekly water changes go a long way with papilios because they are sensitive to old water and sudden swings.

What to feed them

Mine have always done best on small foods offered more than once a day. They are pickers, not pigs. If you feed one big meal, the bolder fish get everything and the papilios end up thin.

• Staples: quality small pellets (0.5-1 mm) that sink, and fine granules
• Frozen: cyclops, mysis (chopped if large), brine shrimp, daphnia
• Live (if you have it): baby brine shrimp, grindal worms, blackworms (sparingly and from a clean source)

I avoid big, fluffy foods that float around forever. You want stuff that gets down to them and stays in the lower half of the tank. Also go easy on super-rich feeding for long stretches. Tanganyikans can get bloaty if you push heavy, fatty foods and skip maintenance.

How they behave and who they get along with

Papilios are not "mean" cichlids, but they are still cichlids. They do a lot of posturing, sand-sifting, and little spats around their chosen patch. The real issue is that they can get stressed by pushy fish and they do not compete well at feeding time.

• Good tankmates: calm Tanganyika species that are not hyper-aggressive and do not hog the bottom
• Be careful with: fast, boisterous eaters and anything that constantly dives on the sand in the same zones
• Avoid: hard-core mbuna-style bullying, big predatory cichlids, and anything that will keep them pinned in a corner

If you want a group, you can do it, but give them space and lots of sight breaks. In smaller setups, I have had the best luck with a bonded pair or a small group of young fish that you let sort themselves out. Watch for one fish getting bullied off the sand and hiding all day.

Breeding tips

If your fish settle in and you keep things steady, they will often pair up on their own. Courtship is usually over sand with a lot of hovering and quivering. After spawning, one of the adults will hold the eggs/fry in the mouth (depending on the specific pairing/behavior in your group).

• Start with a group of juveniles if you can, then let a pair form
• Keep the tank calm during holding - sudden changes or bullying can make them spit
• Feed the group well before and after spawning, but do not overdo greasy foods
• If you want to save fry, a separate quiet tank for the holding fish can help, but only if you can move them without stress

Common problems to watch for

Most problems with papilios come down to stress: cramped footprint, wrong substrate, pushy tankmates, or water that swings around. They are not the fish I use to "test" a new tank or a new filter setup.

• Shyness and hiding: usually too much aggression or not enough open sand and sight breaks
• Weight loss: they are getting outcompeted at feeding time or you are feeding foods that never reach them
• Sandstorms: flow aimed at the substrate keeps them irritated and can lead to frayed fins and constant stress
• Bloat/intestinal issues: often tied to heavy feeding, dirty water, or sudden parameter changes

The best "medicine" I have used with this species is boring: clean water, steady hardness/pH, fine sand, and a tank where they can feed without getting shoved around. Get those right and they are a really rewarding Tanganyika cichlid to keep.