think our Longnose Butterfly has a problem. Last night he was perfectly normal looking. This morning he has a large ugly boil-like lump on his right side beneath his eye. It looks reddish sometimes but the pictures I've (hopefully) included don't seem to show the redness. He's very active and is eating as he normally does.\r\n\r\nHe is in a 180 Gallon reef tank. (Forgive me for this but) the salinity, alk, pH, nitrates, nitrites, calcium and ammonia levels are all well within normal range and have been each week for the past year. We test weekly and do waterchanges weekly using ro/di water for the change. \r\n\r\nThere are about 190 lbs of Live Rock, 3 - 4 inches of live sand the regular clean up crew of snails and hermit crabs with 2 serpent stars, a sea cucumber?? 2 mithrax crabs and a lonely peppermint shrimp. I think that's it.\r\n\r\nHe has been in the tank for 1-1/2 years and is housed with 3 chromis, 3 pj cardinals, 2 false percula clowns, a sixline wrasse and a pink barred shrimp gobie. The latest addition to the tank was the transfer of the gobie from our nano tank which was in good health (the whole tank). The latest "outside" addition is the 6 line wrasse which was added 4 months ago. All fishes are healthy and active.\r\n\r\nThe first picture was taken at 11 a.m this morning the second was taken at 7:45 pm this evening. \r\n\r\nPlease help me identify what's wrong so I can help him!\r\nNone of the other fish in the tank are showing signs of what is happening to the butterfly. \r\n\r\nSo..... Can anyone give me some idea of what is happening to this fish and what can be done to help?