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It is possible that if you are injecting CO2 (which will lower the pH), that excessive surface agitation (that might be caused by increased flow) could off-gas the CO2, thereby increasing the pH.
 

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I forgot where I read somewhere that someone mentioned that with increase flow in the tank the PH increases....

is this true?
Never heard that one before. It's possible depending on certain media in your filtration I guess, but by just upping the flow rate I don't see how.
 

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I suppose it's possible. I don't understand it fully but if protonation can occur when enough water to air contact is made it could cause a change in pH, I think. I'm no chemistry expert but I'm willing to bet this sort of thing is so miniscule in the difference it makes and therefore won't have any effect on us whatsoever.
 
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