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i have a 55 gal planted freshwater tank and would like to also dose it with DIY Co2, my problem is, i have about 8 cichlids in there 6 yellow labs and 2 kribs, will the fluctuation of pH affect my fish?
 

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If the KH and GH is high enough to keep these fish happy the minor drop in pH will not affect them.
I have coral sand as a substrate, and always make hard water for my Lake Tang tanks when I do water changes, so there is no possibility of the KH dropping too low.

DIY CO2 simply does not produce enough CO2 fast enough to cause problems unless there is something else going on in this tank.
 
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