Fish injured from fall.
My goldfish Silk is 8 years old, and several days ago he jumped out of his tank and fell several feet. He had stopped moving by the time we found him and we were sure he was dead. He was alive though and seemed fine when he was back in the water (I now keep his tank covered!), but the next day his tail started to turn red. After a couple of more days, his tail is now completely red, and I'm not sure if he is swimming as well as he had been. Does anyone know what to do for him? Thanks.