Go for adding a tiny bit of crushed coral a bit at a time to your filter. Do this slowly over a period of weeks as dramatic changes in pH can cause fish deaths.Is it possible or common to add rocks to a tank which give off alkaline to 'up' the PH?
Is sea salt used to 'up' the PH and if so how much and would that be OK for the fish?
Thanks
I second that, 7.6 is high enough .Why do you want it higher than 7.6? That is plenty high for most community fish and too high for most. If you are planning to keep cichlids, just switch to crushed coral or aragonite sand for a substrate. They pH will definitely climb.
Put it in your filter, not tank.ive got coral pieces and coral sand in my tank and i dont think its raised above 7.6 yet