I've kept a bunch of "Lima" over they years both Elongatus and the true Sorubim Lima from 3"-22". When they are small under 6" I always fed ghost shrimp and rosies, around 8" I would switch that to a combination of feeders and hikari sinking carnivore pellets. They def prefer company of other shovelnose in the smaller sizes and once one figures out how to feed the others always seemed to learn quickly watching.