About the pH dropping, I suggest testing your KH (buffer). Mine is 3, but that might be too low. You use baking soda (very little at a time) to increase the buffer.
I use Seachem Equilibrium, but it probably about the same as GH Boost. I mix it in my 5g new water bucket with 2-1/2 gallons and there is always a precipitate and white grains in the tank, and the water is a little bit cloudy for about 1/2 hour. It all dissolves.
You should find out what's eating the Equilibrium. My guess is bacteria and/or plants, especially if they're showing good growth.
Last edited by Django; 11-12-2012 at 12:19 PM..