i have a 75 gallon saltwater set up that is about 4 months old. i recently started adding corals a few feather duster and some other soft corals the guys at the store sold me a bottle of marine snow he said its the stuff to feed the new corals after using it a couple of times as directed on the bottle i decided to look up the stuff and get a few opinions on it and EVERYthing i found was pretty negative. in fact most people called it unsafe (raises nitrates) others called it worthless and a waste of time any opinions