Can't get PH up!
Hello,
You do appear to be doing periodic water change. What is your tank size? Usually I say about 20% but different people have different opinions. Usually no need to do more than 50% unless I guess you dropped some copper in your tank and you need to get rid of it fast.
Since when have your pH begun to behave funny? But like I said, it could be gas exchange as well. Because I haven't been running my protein skimmer lately due to pump failure, my pH is also lower but there's no alarm here.
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