the pic does not look great. Hopefully it will recover, you will just have to wait and see. I will try drastically to get it off of the heater. Make sure it is unplugged and cooled off before trying the ice cube trick. Once it is off, get a small PVC
pipe to slip your heater in to keep this from happening again. I have seen some pretty nasty burns on eels and anemones from heaters. This is not splitting behavior, it is survival behavior. Watch it closely. Have plenty of aged SW
on hand and start running some fresh GAC
to be pro-active. Good luck.