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[APD] RE: Daily pH swings and see saws

Maggie, if you raise the CO2 levels to 30ppm before the lights come on,
then it drops to 19ppm after the lights lights go out, you will be fine.
18-7= 11ppm decline.

This is why I suggest a CO2 range of 20-30ppm and to account for some error
in test kits for pH/KH.

Tom Barr

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