I had a similar problem in the past,place as many power heads as possible inyour tank or sump with 1/4" tubing near each intake of power head and draw as much air bubbles as you can into your tank and within an hour the you should have a considerable rise in your Ph.I don't recomend moving any of your inhabitant as this will cause more stress(anyways all the fish should be in hiding)I would even run a 1/4" line into your main pump as well. Draw as much fresh air into the room your tank is in.
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