Just wondering if my led light with a intensity control could be effecting my ph? I have my 120w reef breeder light set at 60%. I also have an Apex controller with ph probe that was recalibrated last night. But I've noticed my ph climbs real slow throughout the day while light intensity slowly comes up. But when it hits 60% the ph seems to climb more rapidly. I'm currently working on getting my ph up to8.3 but its at 7.7 now. It dropped to 7.5 last night. The few corals I have acans, zoas, toadstool seem to be doing good. I haven't been wanting to dose buffer while probe needed calibrated. Just been doing water changes to help battle my gha. I've read that gha will deplete the ph? And you can raise Alk to help rid of gha? Amonia, nitrites, nitrates & phosphates are 0 Mag. 1280 Cal. 400 Alk. 11.5 Ph. 7.7 Temp 79* Tank is 56g, 15g sump, urchin skimmer, vortech mp10, plenty of surface agitation to help with gas exchange. Currently no fish ( died of ich ), 2 skunk cleaner shrimp, 2 emerald crabs & few blue hermit crabs. I got some chaeto, crabs coming to help with gha.