i used to hav my PH like that but i put i down more, so i will fix it. as for the skimmer, that is the one that the lfs sold me. they said it would be good, especially since it is rated for a 125 gallon. i realized that thing that puts the bubbles in my tank is when the small little hole on the outake for the sump blows across the surface, it blows all the things from the film on top of the tank into the water, i think