One of my angelfish just started freaking out and then had obvious trouble swimming. I immediately moved her to a smaller tank nearby. It was already set up and heated - I had planned to move different fish to it in the morning. Anyway, now she's lying on the bottom of the small tank on her side. She's still breathing. The tank she's in now had all the same parameters as the tank she was just in, so aside from the obvious stress she's in, I don't think there's any shock. I turned the heater up, added some stress coat. Should I add salt? Is there anything else I can do? She was my first angel so I'm really attached to her I know it's been about 5 years, but I expected her to be ok for another 2 or so.