I have a lot of tangs in my tank ,about 15 of them and out of these 3 are blue tangs but I never had a problem with them, have since day 1 a 55 Watts uv sterilizers and a cleaner wrasse and I think this is the magic combination. .rather invest in a good sterilizer then thorn out the tank to catch the fish or even worst loosing all the fish's. ...