My tank is going on 3 weeks old and everything looks healthy, however my PH test appears to be low. It has held at 7.8 the whole time no matter what changes I make. I've tried bigger water changes and multiple 10% changes a week. I have also started dosing with PH buffer last Thursday and so far still have seen no change. Alk, phos, nitrate,nitrite,ammonia, Ca are all within normal parameters and I have tried using 2 different Ph test kits. Does anyone have any other suggestions to help raise Ph?