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I turn mine off at night same as abc.

Are you using a drop checker with 4dkH solution inside it? It just seems to me that 2bps into a red sea reactor is extremely low for a 90 gallon tank. I use about 1.5 bps into a Rex Grigg style pvc reactor and have just the right amount of CO2 in my water.

I would also suggest letting your tap water sit overnight and then check the pH. My tapwater comes out at around 8ph and after sitting it is down to 7. My kH is around 2 so I add enough baking soda to bring it up to 3d kH and I run my tank at about 6.1ph during the day with CO2.
 
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