around 6.5 to 6.7. depends on the media you are using. some media will turn to mush at lower ph but i'm using reef bones and have hit 6.3 in my chamber and the media is ok. just watch your media and your tank KH and CA and adjust from there. remember when you make adjustments, make small adjustment and give it a day before checking your parameters again. keep a chart going as to drip effluent to bubbles co2 and then you can compare how drastic of adjustments give you so much KH and CA readings, if that makes sense.
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