Wait a minute... I may have just come to a realization, would the over-use of prime make the water more acidic? I tend to use it pretty religiously and I know it SMELLS like sulfur though I don't know the actual ingredients, im gonna look that up right now but if sulfur is a main ingredient then that could be making the Ph lower and because there is such a buildup in my tanks perhaps that could make the water more acidic?