Freshwater care
Choose a catfish that fits your aquarium
Corydoras, plecos and the risks of buying a “cleaner fish” by name alone.
“Catfish” is not one aquarium animal
Thousands of fishes share the catfish label. A small Corydoras, a common pleco and a large predatory catfish require very different tanks. Ask for the scientific name and adult length before purchase. Avoid “algae eater” as the only identification: that phrase is a sales description, not a care guide.
Corydoras: social bottom foragers
Many commonly sold Corydoras are peaceful and should be kept in a group of their own species or a closely compatible group. Provide smooth sand or fine rounded substrate so sensitive barbels are not damaged while foraging. Leave open floor space, add cover, and maintain clean, well-oxygenated water. Offer sinking foods that reach the bottom; leftovers from top-feeding fish are not a balanced diet.
Plecos: look beyond the juvenile label
The name “pleco” covers small and very large species. Some common plecos outgrow standard home aquariums and produce more waste than owners expect. They may need driftwood, vegetable matter or specialized protein depending on species. A photo and exact scientific name will help you research the adult fish. Never buy one to “fix algae” without also solving excess light, food or nutrients.
Check compatibility and maintenance
Bottom space is finite. A tank full of caves is not automatically spacious if territorial fish compete for the same floor. Watch feeding after lights dim, especially for shy species. Test water and clean substrate as part of routine care. If a catfish stops feeding or shows damaged barbels, investigate water quality and substrate before adding medication.
Source and further reading
Check the scientific name and local laws for any species you plan to buy, keep, catch or release. Care needs vary by species and circumstances.