My marine puffer had a sore on his mouth and his behavior wasn’t usual he would normally look at us and interact but when he had the sore he would hide behind a rock and wouldn’t come out at all not even to eat. However I did take a visit to a fish store and got him the antibiotic metroplex. The first day of that his behavior was energetic and swimming and splashing around . Now I missed one days dose if the metroplex which hasn’t seem to affect him in behavior but today I have noticed even though the sore by his mouth is beginning to heal more and more , but now his cheek is seeming to grow a light pink patch with some black little dots around it , which was not there before , I want to exactly what is wrong or what I’m not doing correctly so therefore I can finally solve the problems in this tank and get him better before it gets worse . I read everything I can about ichthyophthirius and it may seem like it’s a huge possibility but I can’t say for sure because I also am new at all of this . Please help !