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Have you checked the calibration on the PH probe? If it's actually lower than what its reading, that could be contributing to whatever caused the coralline to dissolve. Just a guess.
Yea,it's too close. I thought about that after I posted the pic. I wanted to put the water drums there but there is a duct over that area so there isn't enough head room to stack them. Looks like the drums are going to go behind the wall. I was hoping to keep the bar even or short of the hall to...