Hey all, has anyone ever noticed an ATS causing Ph to decrease? I have been having a hard time getting my Ph over about 8.2 with heavy Kalk and Mag dosing, to the point of seemingly harming my hammer coral. I just assumed it was the way my tank was (I have used an ATS since day one so I never saw a difference)...still a bit of a newb to reefkeeping...but recently a friend of mine installed a scrubber and she has noticed a significant drop in Ph as well. Apparently she is now having a hard time keeping it above 8. Any ideas? Does the green algae produce a lot of CO2? Enough to lower Ph in a 125 around .4 in a couple months?