u/BeneficialFish8922

hello I’m new, idk the rules about posting here but I could really use some advice on how to help my Cory. His name is Peeper, he has been in a hospital tank for about a week or so maybe. I put him in there as soon as I noticed signs of fin rot. I’m not sure exactly why illness he had or what was making him sick so I started off with Kanaplex which didn’t work so switched to Erythromycin which seemed to work better. We did a day of that and Melafix together and saw significant improvement, his tail and fins had healed almost drastically. We continued with the Erythromycin for one full course of treatment. We were concerned that it might be parasites so we did food soaked in metroplex. For a few days he wasn’t eating but last Thursday he had a spike in energy and was happily swimming around and ate the medicated food. He continued on like this for the next day or two. We stopped with the erythromycin like it says and he slowed down again and started to look pale, and stopped eating. We started the second round of erythromycin on Saturday or Sunday I wanna say. His color returned a bit and we kept up with the medicated food, (he doesn’t seem to interested in it but he will eat some) and his color returned a little. He mostly just lays/sleeps around all day. I know cories like to be with other cories so I wonder if the loneliness is started to get to him. If so how am I supposed to be able to tell whether or not he’s still sick or when he’s recovered enough to return to the main tank? I could just use some help knowing what to do or just validation that what I’m doing is what he needs to get healthy again.