Basically he just lies on the bottom a lot. He kind of has a C curve in his body, with his body resting on the bottom and his face toward the water surface. He was really struggling to get to the top to breathe. The fish places said older betas can really benefit from a lower water level (he's in a one gallon tank that he has all to himself). So, I lowered the water level and then he improved dramatically for about a month, but has started to decline again. I typically have his water just a little salty. I have tried adding a little slime coat to the water as well.