My tiny sweetcorn sized box fish looked a bit dusty last week, he seemed to get over it and was back to normal. Yesterday he was in the bottom corner of the tank again looking all covered in white. This morning he was in the corner again, then was stuck up against the weir comb, I'm assuming dead. I took my daughter to school came back with the intention of moving it but it was gone. Only sign of the Kole tang was he was behind a rock at the back of the tank and he seemingly has been there all day. I came home from work and put some brine shrimp and garlic in, he came out darted around and ate a small amount then went back behind the rock on the bottom where he is now. When he was out he looked worse for wares, was very pale and his fins weren't out as usual. Puffer, Cardinal and two clowns all seem OK. The only one other thing was last night under the aquarays one of the clowns looked like he was a bit spotty perhaps a few areas of white dust - today he looks fine, will tell for sure under the blues later. Only thing I've added was a UV unit at the weekend. All tests are OK and shown below. [tanktests:25irxms4]BigLarry[/tanktests:25irxms4] Not sure what to do, just leave it? If the tang dies do I fish it out or leave it to erm rot?? Thanks, Larry.