I don’t think there is any choice but to go fallow. Option 2 is to try and manage it but who wants to watch their fish die off and just throw money down the drain. I get that some old tanks seem to manage ich better but newer ones its a death trap for them from I have seen. I would love an option 3 if I ran into it again.Another story of fallow not working. Thanks for confirming about wasted time with a fishless tank for months.