I saw the prettiest purple tang for a great price, bought it on sight. Took him home, acclimated, and everything was perfect. I went to sleep. Next morning I wake up, chaos. The purple tang has ick and velvet, and it beat my clownfish and blenny to death. The entire tank of coral is dead/dying and all the inverts are dead- tang was in copper water and I didn’t know. Harassed my ruby red dragonet so badly it jumped out of the tank and was crusty on the floor. Then the tang itself succumbed to the ick/velvet. Complete loss.