Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

Platydoras costatus is renowned for its incredibly peaceful and somewhat reclusive nature. They are notoriously shy during the day and will stubbornly wedge themselves into tight crevices. When handled, they can produce audible croaking or squeaking sounds by locking their pectoral fins. They will never bother tankmates that are too large to be considered food.

Diet

Omnivore

They are unfussy, nocturnal omnivores that will scavenge the bottom for leftover food. Sinking carnivore pellets, algae wafers, and frozen bloodworms make an excellent staple diet. They appreciate occasional treats of live blackworms or chopped earthworms. It is important to ensure food reaches the bottom before faster surface fish consume it all.

Sex ratio

Solitary

Sexual dimorphism is virtually non-existent, though mature females may appear noticeably rounder when viewed from above. They can be kept singly or in groups without any territorial aggression. A group of three or more often share the same hiding spot during the day. Keeping them in groups makes them slightly more outgoing.

Feeding frequency

Twice daily

Since they are strictly nocturnal, it is best to feed them just before or after the aquarium lights go out. Feeding them once a day is usually sufficient for adults, while juveniles can be fed twice. They will use their barbels to locate food in complete darkness. Overfeeding should be avoided as they are prone to becoming obese.

Bioload

Platydoras costatus contributes a moderate to heavy bioload, typical of thick-bodied catfish. They are robust eaters that produce significant waste, especially as they grow larger. Strong mechanical and biological filtration is necessary to keep the substrate clean. Regular gravel vacuuming during water changes will prevent the buildup of detritus.

Flow

Stagnant

They appreciate a moderate water flow that provides adequate oxygenation. While they do not need torrential river rapids, stagnant water should be avoided. The current helps distribute scents, allowing them to scavenge more effectively. A well-placed powerhead or strong canister filter output will keep them comfortable.

Reproduction

Oviparous

Captive breeding of this species in home aquaria is virtually unheard of. In the wild, they spawn in the wet season, scattering eggs among vegetation. Commercial breeding is often achieved using hormone injections in large aquaculture farms. There are no documented cases of spontaneous spawning in typical hobbyist setups.

Compatibility & tankmates

They are extremely peaceful community fish but will eat anything small enough to swallow whole. Small tetras, rasboras, or dwarf shrimp will likely disappear during the night. They do excellent with medium to large community fish like robust cichlids, larger tetras, and gouramis. Their heavily armored bodies protect them from mildly aggressive tankmates.

Tank level

Bottom

They are strictly bottom dwellers that spend the majority of their daylight hours completely hidden. They require plenty of caves, driftwood tangles, or PVC pipes to feel secure. At night, they will actively patrol the entire bottom footprint of the tank. A soft, sandy substrate is preferred to protect their sensitive barbels.