Disease identification

[Arron Miyuki]

Hi guys, my A. agassizii has this white thing protruding at it's tail. It seems like a sore or some sort. Definitely not fuzzy like fungus. Also, it's belly is very large. Doesn't seem to be like dropsy. Overweight perhaps?
My A. abacaxis-wilhelmi on the other hand has it's scales discoloured. I'm not sure if it's due to a physical injury from being chased from the agassizii though. It also seems to be breathing heavily all the time. Gill flukes probably?
Any suggestions as to what these problems probably are and medications that I should use? Thanks!

[Arron Miyuki]

Here guys, a clearer pic of the agassizii.