Had my 90 gallon up and running for three days now... water,sand, 50 lbs of dry base rock, pumps/filter/heater/lights on, and now i am having to scrape a hard white film off the glass every 12 hours or so... i came home from work and had to spend quite a bit of time getting the hard white film off the glass with a mag cleaner, and this morning i had to do the same thing.... last night i noticed that my pH was around7.98, so i dosed again with Seachem marine buffer which brought it back to 8.23... could i have added too much and this is what i see on glass, and if so, what can i do? I have live rock being delivered tommorow... thanks.... Bunker