I haven't seen the fish scratching since I moved them and they have been devouring the CP food (Dr Gs antiparisitic caviar). It doesn't say how much CP is in it on the bottle and I haven't had a chance to find out out. But it's a good change up from the pellet foods. I tried PE Mysis a few times and they didn't seem to like it as much. Anyway, just wanted to give an update.