So a couple weeks ago I bought a purple dottyback from a lfs.. and the next day I noticed it had ich.. I was waiting it out hoping the fish can fight it off.. I was thinking to get a ich solution.. but I heard they are not invertebrates safe.. and I have snails in my tank.. a couple days ago the dottyback died.. and yesterday my clowfish also died from ich.. now I only have a yellow watchman goby.. so far I see just one stop on him.. so now I'm thinking what should I do.. as ich may be still in my tank.. will doing a water change get rid of them.. is their a invertebrate safe ich solution in stores.. I want to buy the fish I had again.. but I'm just afraid their also going to get ich and die