If the dinos arent present in the sand bed or on the waters surface, then your ahead of the game, because normally they're everywhere....I've battled them on and off for years and a lot of people here will say that this stuff is snake oil,but Im here to tell u it works....I keep sps,lps,softies, not to mention many of them are exp..corals...High Kalkwasser levels def. helped me a lot but never eradicated the stuff......Here it is, give it a try, and I think you'll be pleasently surprised, I know I was. Kordon Ich Attack(Aquaherbals)....The cover reads :treats diseases caused by Ich, Fungus,Protozoans,and Dinoflagellates......but Im here to tell ya it kills the dinos not just the diseases they can cause....I bought the stuff by accident, called the manufacturer, and one of their scientists assured me it would work, and it most def. did....Good Luck. P.S. The stuff is comprised of nothing more than herbs, and it smells like decaying sage...:cry: