7.6 8O What kind of salt and substrate are you using? 1 hour after I mixed my salt water (Instant Ocean, by the way)and poured in my aragonite sand, I had a ph
You can try adding a little sodium bicarbonate if you are doing fish only or even calcium hydroxide solution (kalkwasser) if you are planning on raising corals to raise the ph
, but I am really suprised it is that low. The live rock should raise the ph
just because of the amount of calcium that is usually in the rock (dead corals or limerock).