New to saltwater have had fresh water tanks for many years. My wife an I decided that we were going to take the plunge into saltwater. We purchased a 24g nano. local LFS helped get everything together. We did a quick start tank with dry rock and we added clownfish first day. I questioned this but LFS said it was ok to do. They both died within 3-5 days so we waited. Two months later we go back and get 2 more clownfish they are doing great swinging in the tank and I see no issues they are eating and they seem healthy. About two weeks later I go and get two LPS corals a chalice and a blasto place them in the tank. I dipped the corals like I was instructed to and acclimated them to the tank. The clownfish seem to be doing well, later that evening I notice white spots on the clownfish. They are small and all over both of them. I think ok its ich. but not sure a few hours later one of the clownfish is dead. I pull it out and I notice it has lost it's color basically it turned white and looked slimy. The second one also died a few hours later. The same thing lost its color and slimy. I have looked on the forums and I'm thinking it's Brook. So now for my questions as I've stated I am new to saltwater. I have a few hermit crabs, a counch, Trouchus snails, pepermint shrimp and a emerald crab plus the 2 corals. Do I have to remove these from the tank or just let the tank fallow for 90 days? I purchased another tank for QT purposes I just have to wait for it to cycle. Did I do something wrong? Could the fish have been sick from the local LFS? Could the corals have had something? I did add 5 Trouches snails at the same time as the clownfish. Any and all help would be great thanks in advance.