Well I have at least one tank that seems to be on steroids! It's a small nano tank, but the shrooms are getting crazy huge! Instead of laying flat they are displaying a huge stalk like base with a head that is about at least 4 inches. I saw a pic. recently of a shroom eating a cardinal fish. (Eric Bornemans)...My little oc. clowns seems to be food for them now, as I don't trust them. Should I be concerned?