Sigh. I could probably fit one in my 29, if I don't get kuhli loaches. But I really want kuhli loaches, but the plecos are so cool! And I assume a 10 gallon would be too small.Size of tank is highly debatable. They max at around 4.5" so up will have to determine based on your stock and maintenance schedule. These are dwarf plecos though, so they do not grow as large as common plecos.