did your ph stabalize? I had that problem (similar at least) A while back when i had my old 40 gallon. I guess if your ph stays higher, and I mean stays there you shouldn't have that problem.
now for my dumb question, i had a strong metal stand with my old setup, but i got this beautiful wood stand with cabinets now with my 66 gallon. Will it hold my new aquarium?
what kind of stand do you have?