oh.. you got the ich. It is a parasite but stressing the fish will make it worse. How many fish do you have left? Your corals will be fine but transferring them to another tank might be a good idea if you want to treat the remaining fish.
bluejaw trigger - dead
flame angel - dead
4 clown fish, - 1 dead.. so far
blue tang - acting funny, dnt think it will make the night..
yellow tang seems to be fully healthy
diamond goby looks 100%
2 chromis seem ok but they hide all the time, they hide ever since i got them, (first fishes to the system - tester fish)
purple tang and coral beauty seem fine in my anemone tank
yellow watchman, and scooter bleny seem to be fine aswell. to answer the question.. 12 still alive out of 15?. oh my wrasse died aswell.