Hello everyone, I have a black clingfish which i have had for about 4 months. About 3 days ago I noticed what looks to me a small abcess looking bump on the right side of his face, close to his mouth and is kind of clearish/white about the diameter of a number 2 pencil eraser. He has slowly been losing his appetite and is usually a pig. He seems to be breathing a little faster than normal and opens his mouth a little like he may be struggling to breathe. He has stopped coming up on glass to greet me and my girl friend. Salinity is at 1.025 ph at 8.1. Tank is about 7 months old. Will try to get a picture. All other fish are doing great and i have never seen any agression from other fish towards him. Let me know what other info is needed