My wife has 5 FBT and the other day I noticed one of them had an eye that was a little swollen and gray. It seemed to happen out of the blue. Other than that he seems to be quite happy and fat. My wife thought that it may have gotten bit in a feeding frenzy and he is the one that likes to soak in the water all the time so I don't know what to do. I am new to frogs so anything would be appreciated. Thank you.