increase pH or decrease? mine is around 7.9-8, trying to buffer it up a little with seachem's reef buffer™(have good alkaline, like 4.5 MeQ/L) my fresh mixed salt water have 8.3 pH but drop to 7.9-7.6 slowly (usually take a day or 2, 12 gal nano) someone told me it is due CO2 problem, so im wondering will purple up increase or decrease pH?