I have a Betta (Beau) who has several things wrong with him. Wednesday night around midnight I noticed one of his eyes were poping out. He looked fine that mourning. I had nothing here to help him, so I ventured out to the only place open that would have something ... Wal-Mart. I picked up some MelaFix (which was all they had besides stuff for ick). After about an hour or so, he started acting more normal. The next mourning I noticed something was wrong with his mouth (looked like flesh coming off it). I immediately went to PetsMart and picked up some salt and some Maracyn-Two. He looked and acted better the rest of the day. Friday night (around midnight once again) I noticed that he now has an open sore. I am stumped ... I do not know what this is or how to help him. Some say "100% water change" some are saying "let the medicine build up first". I do not know what to do. I do not want to stress him by changing the water. I have a very small tank (3-5 gallons) I have to net him to get him out. I do not know if I should allow the meds to build up. I cannot seem to get him to eat his usual pellets (must hurt his mouth or they are too big). I was able to get him to eat a couple of flakes and a brine shrimp (in jelly). Anyone have an idea of what this is or how to treat it? I have a pic to go with it, I do not know how well you will be able to see him. I welcome any and all suggestions.