Can't it live in a 10g or 20g. Why does it have to be 55g and above if it only grows 3 inches? Pls explain anyone? I currently purchased one for my 20g tank with 1 Blue Ram, 2 Blue Dwarf Gourami, and 4 White Skirt Tetra. Another for my 10g tank which contains 4 guppies and 1 corydoras.