My betta, Dolphin developed a large lump directly in front of his right eye about a month ago. I have tried aquarium salt, Macyrin Two, and Melafix. It is only getting larger. Part of it has turned white, and a small amount of it is red. He has seemed to be less active and he has been trying to stay at the bottom of the tank, and hiding quite a bit. Dolphin is still eating and moving. He is in a 5 gallon tank with 78F water with a filter. I do water changes every week. Please help!