My pond was about 60* yesterday, but I still put the waders on and went in to net one of the larger goldfish that had what appeared to be a small amount of fungas/tail rot. Luckily they were still moving slow and I got it on the first try. Getting in and especially out of the pond in wadders can be a trick and if you are carrying something even trickier. Gave the fish a good salt bath, cleaned up the fin with iodine and gave the fish a good salt bath, then let it destress a bit in a large 15gal container with a low amount of salt water. Placed her back in the pond last night, had no red streaking and minor tears, less stress with her buddies, but I'll keep a close eye on it.