Well if there is something I do know about is reoccuring ich, did you keep the meds going 10 days after the ich was no longer noticable? You need to. Also something in that tank is creating stress. Also if you use feeders, they may be the culprit. Do not leave feeders in the tank if they are not eaten right away. I had this same problem this week and was told to raise my temp to 90. Guess what, along with using meds the temp that high worked, only one spot of ich left and it will probably be gone by tomorrow. Find out whats stressing the fish. Does the temp drop alot at night? Check that, temp fluctuations will do it everytime.