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Need help lowering PH. PH is at 8.82 with a pinpoint meter and test strips. Everything else looks OK the only thing I haven't checked is calcium. All the corals and fish look very healthy. I have a corallife skimmer on a 55gal tank I do not drip calc and have been adding 2tsp of baking soda at night. My new water measures 8.4 with kent salt. Need advice
 

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2tsp per night of baking soda is almost definitely the culprit. What's your alkalinity? What's the reasoning behind the baking soda? What's the size of your tank?

My advice would be to stop with the baking soda for a while and do some water changes.
 

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Baking soda itself has a pH of around 9-11. For some reason, most things that boost alkalinity do have a high pH. I believe baking soda will release CO2 out of the water. CO2 has a low pH, and thus the immediate pH reading of baking soda in water will be lower.

It will raise alk over time, but pH will also go up with that much baking soda being added.
 
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