Well my green sunfish lovingly named a$$ hole by my ex girlfriend finally died tonight after 2 years. he stopped eating for over a month and had a growth on one side. I thought it was a tumor of some kind. well after he died i did some exploring and filleted out that one side. I started cutting inot the mass from the back side towards the scales. as soon as i got through to it a massive amount of yellow bloody puss came out of it. so somehow he managed to get an infection under his skin and i'm pretty sure that's what killed him. but on the plus side i do have an empty unheated 30 gallon tank to mess with now.