I have a new 55gal set up. No live plants, has river jack gravel, no other rocks. Aprox 2 days after I set up tank my fish started dying in my 30gal. I removed all fish from 30 and put in 55. Figured i would give it a shot being I had a prob with 30. It is 2 weeks later and all fish are still alive, but my 55 has remained a constant Ph of 7.6. I figure it must be my tap water. I do not want to use PH down because it is garbage, lasts for maybe 2 days and goes back up from past experience. All else is good on 55 except for PH, Biologically it shoul be ok being I have 2 bio filters on it and plenty of fish for 2 weeks. Is proper PH a reliable product or is it garbage also?