We put him in a bucket of epsom salts for 10 minutes and today he started pooping! The starting end of it was very large - twice the diameter it normally is. This is about the first 1/2" or so. Then it is normal size. But the color is not normal, it is almost clear. Very odd. But he is continuing to evacuate and also swimming around a bit more and is hanging on the wall again. Hopefully he is going to be ok!