the guy that owns the lfs here has a nice 14-15" clown in one of his display tanks and he told me he grew it up to about 12" in a 29 gallon alone feeding mainly algae wafers.i dunno if this helps u any i had a clown knife that wouldnt eat anything so he met his maker after about 3 weeks. i like the fish but thru my experience i wont ever have another.