I am trying to do the best for my goldfish, but they continue to get worse despite my attempts. After I treated them with Quickcure for 6 days to cure them from the couple ich spots I saw, I put them back into their cycled tank, and noticed they had white edges to their fins and were sitting at the bottom and one of them was swimming very excitedly instead of its normal friendly coming to the front. I read online that white edges on fins means fungal fin infection. So I put them all back into their 10 gallon quarantine and have been treating with API Fungus Cure and doing 100% water changes every 24 hours. Last night was their third treatment of four. There has never been any improvement but this morning they are markedly worse. I am in tears over the black lionhead who looked fine last night. It is like his skin cracked open. on the top of his head and two spots underneath on his neck. Is this something infectious, or did the tiny bristlenose pleco attack him last night? Should I put the back into their tank or treat with something else if I have seen no improvement from the Fungus Cure? How should I help the apparent wounds on the lionhead? He of all three of the fish was the most healthy acting yesterday. I will be getting rid of the pleco today, just in case it was him. I feel sick and don't know what to do!