not sure what you mean by that? Octopus require immaculate/clean water quality. but im guessing you mean no corals? if so thats due to the fact that they dont like light. he has plenty of toys and stuff to play with though. also to much rock/cover makes it hard to ever see them. hope i answered your questionhmmmm not to pry or anything, but why is the tank immaculate not a spot of anything on it ?