Xenochromis hecqui (often listed without a stable aquarium common name; avoid confusing with Hecq's shell-dweller)

Where they come from

Hecq's cichlid (Xenochromis hecqui) is a Lake Tanganyika fish. In the wild they hang around sandy areas and open bottoms where they can pick at tiny critters in the sand. They are one of those Tanganyikans that look calm in the store and then make you realize why "expert" gets slapped on the label.

Setting up their tank

Give them space first, decor second. They are active and they want room to move, but they also need a few visual breaks so one fish cannot stare down another all day.

• Tank size: I would not bother under 75 gallons for a small group. 100+ makes your life easier.
• Footprint matters more than height. Long tanks beat tall tanks for these.
• Substrate: fine sand. They sift, spit, and mouth sand constantly.
• Hardscape: a few rock piles at the ends or back corners, leaving the middle mostly open sand.
• Filtration: strong and steady. You want high turnover without blasting them with a jet stream.
• Water: hard, alkaline, and stable. Think Tanganyika numbers (high pH, high KH/GH).

For flow, I like to aim circulation along the back wall so the open sandy area stays calm. If the sandbed is constantly drifting, they get edgy and it becomes one more stressor.

What to feed them

These are micro-predators and sand pickers. In my tanks they did best on smaller foods offered more often, not one big messy feeding. They will eat like pigs, but you will pay for it in water quality if you let that run the show.

• Staples: quality pellets sized for cichlids that lean carnivore/invertivore (not heavy plant-only herbivore formulas).
• Frozen: mysis, brine shrimp, cyclops, chopped krill (sparingly), daphnia.
• Occasional: live foods if you trust the source (blackworms can be great but can also foul a tank fast).
• Avoid as a main diet: fatty mammal meats and big chunks of food they chew and spit everywhere.

How they behave and who they get along with

They are not "community" fish in the usual sense. They are more like "you can keep a group if you manage the politics." Males posture a lot, and a dominant fish will happily make one weaker fish miserable if the tank is tight or too bare.

• Best grouping: 1 male with several females tends to be smoother than multiple males in most home tanks.
• If you try multiple males, you need a bigger footprint and more line-of-sight breaks.
• They appreciate open sand, but they also need places to retreat behind rocks.
• Expect chasing during feeding and during spawning cycles.

Tankmates should be chosen carefully. I have had the best luck with other Tanganyika species that are not timid and do not share the exact same niche. You want fish that can hold their own, but not ones that will escalate everything into a nonstop brawl.

• Usually workable: some midwater Tanganyikans that are robust and not overly aggressive, and certain rock-dwellers if the rockwork is clearly separated from the sand flat.
• Often problematic: very timid species (they get bullied), super-aggressive bruisers (they keep everyone stressed), and anything that needs the same open sand territory.

Breeding tips

If you get them settled, they can breed in captivity, but they do not make it easy. Spawning behavior ramps up the aggression, and the whole group dynamic shifts for a while.

• Condition them with frequent small feedings and big water changes.
• Provide a broad, clean sand area. They like to use open substrate zones.
• Keep the water stable. Sudden swings in temperature or hardness can interrupt spawns and spike stress.
• Have a plan for separation if a female is being harassed too hard. A divider or spare tank saves fish.

Common problems to watch for

Most issues I have seen with Hecq's cichlids come down to stress plus water quality. They do not tolerate "close enough" the way some hardy cichlids do.

• Bloat and digestive issues: usually tied to rich food, overfeeding, or chronic stress. Back off food, improve water changes, and reduce aggression triggers.
• Beat-up subdominant fish: torn fins, missing scales, hiding, not eating. Fix the social setup, not just the symptoms.
• Ich after new additions: they can break with stress. Quarantine new fish and keep your temps and parameters steady.
• Sandbed funk: uneaten food sinks into sand and rots. Feed smaller amounts and vacuum lightly without stripping the whole bed.

If you want the "secret" to keeping them, it is boring: space, stable Tanganyika water, tight maintenance, and managing bullying early. Once the group settles, they are seriously rewarding to watch.