Hypancistrus margaritatus (L404)

Hypancistrus margaritatus is a Hypancistrus named for the regular, round white spots on its dark body (the "pearl-spotted pleco"). In the hobby it is known by the number L404, and it was described in 2016 from the Rio Negro basin as H. margaritatus. It is considered large for its genus, reaching 12–13 cm.

It looks similar to spotted Hypancistrus such as L201 and L102, so a reliable label and source are important. It spends the day in its cave and may barely be seen during the first weeks.

• At least 150 liters for 1–3 fish, with a separate cave for each.
• 27–29°C, good aeration and moderate to strong flow.
• A 30% water change every week; soft water is preferred.

Mainly carnivorous. Make bloodworms, mysis, pieces of shrimp and protein-rich sinking foods the staple; it also accepts small amounts of vegetable tablets.

Peaceful and nocturnal. Males chase each other over caves and leave other species alone. It loses the competition for food to fast, greedy bottom dwellers.

Good companions: Cardinal tetras, rummy-nose tetras, apistogramma, discus, corydoras.

Avoid: Other Hypancistrus species (hybridization has been reported), large territorial plecos, aggressive cichlids.