That's a pretty large difference. I try to keep maximum temperature differences below 5 degrees.
The fish is under a lot of stress right now, so check daily for any signs of disease.
Ich is a common parasite for fish under stress. Ice can be identified by white spots appearing on the body of the fish.
Ich: https://en.wikipedia.org/wiki/Ichthyophthirius_multifiliis
not a stranger to ich, being a primary killer of my fish in tanks when I was a kid. I'll keep a lookout for it. Good thing is the storm will bring cooler temps a bit here, so hopefully make the GF more comfortable.
what is the max recommended temp for GF?