Pics look like what I am going through. i still think its your Alk I can post some of my pictures but they are the same as yours more or less.
7 is a bit low for Alk I am trying to bring mine up from that as well but my PH is at 8.5 so trying to bump it slowly.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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