Mine grazes on algae it finds on plants, slate, and wood. It eats flakes, freeze dried tubiflex worms, algae waffers but it loves a slice of blanched cucumber anchored to the gravel. A RTS basically eats anything and everything a little at a time. Mine is in a 55 gallon tank at this time but when he was just over an inch long he was in my 29 gallon tank.