I have a 50 gal reef tank and have enjoyed it totally until I have tried to introdce any type of fish or do any sort water change or added any sort of wildlife to the mix...all is good til the white spots start t appear, my problem i think is ICH.. the stress has killed a couple of fish and have upset the kids... I know you can't add cooper to the mix. but what I heard was that if you put a drop of garlic oil on the food when you put it in the tank that it will be better to get rid of it-- please help-- I am tired of the fish dying.....does anybody use this stuff and where do I get it from??