I have heard it said many times that UG doesnt like high N levels. The WCs could be causing this or heavy Macro dosing if you are using ferts. I just converted mine less than a month ago and dont have any melt off. My tank was a previously established tank (Scape swap) and I havent dosed it yet. It would be worth looking into.
I just tested my water and N level is ZERO, NH is ZERO, pH is 5.8
I have ferts but I did not dose this tank. I do add a little bit of Excel right after WC.
So WC can cause melting? What should I do? Just change once a month or wait on WC until I see the UG stabilize?