I got 4 electric blue rams about 2 weeks ago. They were doing perfectly fine until last night. One of them were gulping some air on the surface. I thought he was stressing out, I moved him to a hospital tank with stress coat. This morning, he died. 
Now, there is another one is at the bottom. and he's getting weaker. I really don't know what's going on. Anyone has any suggestion? The water parameter seems fine. 0 amonia for sure.
Thank you.

Now, there is another one is at the bottom. and he's getting weaker. I really don't know what's going on. Anyone has any suggestion? The water parameter seems fine. 0 amonia for sure.
Thank you.