I have two German Rams in my tank and I just discovered the bigger one breathing hard and lying on its side at the bottom of the tank. I just did a water change 5 days ago and my temp has been steady at 80C. The other smaller Ram is doing just fine. I haven't noticed anything different on the exterior. The only possible difference could be its belly. It may be a little bit bigger, but I may just be looking for something. Any ideas? I'm stressed!