Elaine,
I really appreciate your response. I put the Angelfish in my
hospital tank and treated the water with an antifungal medication since
upon further inspection it looked like a fungal infection. I am also
feeding the fish an antibacterial food to hopefully prevent secondary
infections. My fish in the 90-gal all look fine I was planning to feed
them an anti-parasite food followed by an anti-bacterial food just in
case. I am also bringing the temperature in the 90-gal back down to
around 75F. I had it up when I was concerned that that other fish
might have had ich. I have had better luck in the past keeping the
temperature lower. Do you have any recommendations for the temperature
in the hospital tank?

Thank you,
James