I don't even know if fish can get them. I have four black angelfish, still pretty young, and they've been doing great. I noticed something white on the side of the eye on one of them earlier today, and I just got home from work and it looks exactly like a cataract completely covering the eye... except it sticks out from the eye a little bit. The other angels (and the other eye on the sick one) are fine. What is this stuff???