i for the life of my have been having trouble keeping my PH stable.
for example today i dosed my 2 part about 40 ml of alk. brough the ph to about 8.2 by the end of the day when the lights were off it was at 7.8 ish, i dosed a little more to hopefully improve the swings, went back up to about 8 ish, a couple hours later it was back down to 7.8
yes the AC is on, but the tank is in kind of a larger room. Surface agitation. Skimmers on. Fuge on reverse lighting.
skimmer air intake has a hose going out of the stand..
any other ideas?