Aquaforest rocks the pink ones and the Carib sea purple ones are the only ones I have in that tank and Carib sea Fiji pink sand if that helpswhat kind of rock do you have? I have heard some of the artificial rock can raise/release alk. I would check everything else. If nothing else seems out of place then I would take a small piece of rock out and put it in some fresh saltwater. Measure alk before placing in the rock and then after 24 hours of the rock being in it.
Running seapora carbon and filterfloss
And of course just regular bio max by fluval and some by aqua clear
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