I have an 80 gallon tank with a powder blue tang, copperband butterfly, 2 clownfish, and a target mandarin. I recently bought the powder blue tang and added him to the tank after 45 mins acclimation. The next day or 2 I noticed a few small spots on his fins and soon to be on the copperband. I am treating with kordon ich attack and have heard mixed reviews on this product but thought I would give it a chance with a non-severe case of ich. I started a 9w turbo twist uv sterilizer 3 days ago and have been treating with ich attack for 24 hours(2 doses). Both fish are eating like maniacs and so far the powder blue tang is flashing less. I will keep you updated for the next few days.