But it's growing a bit larger and the lighter blue area is spreading so I figured I'd post some photos and see if anybody has any ideas. Nobody else in the tank seems to have anything like this so I'm guessing it's some sort of bacterial/fungus thing from the hole in the fin.
problem is I don't have a hospital tank large enough for him so I suppose my only option is to treat the whole tank?
Thoughts/advice?
*This is a horrible photo but shows the growth coming out a bit.





