I do not know what to tell u , but my action would be not to add any new fish for several months . I put all my fish through treatments an then Qt and observe . I even Qt and observe my corals for about 3 to 4 months before adding to D T . I make them as a small D T and enjoy while they are there . They have to pass my strict standards before being added . It's when I rush or overbuy that I have had issues . So I have learned to put a lock on my wallet