Re: Charcoal filter question
No problems.
Once filtered I doubt it would be low (i.e. overly acidic), however if it is, I would add more brightener to bring it more alkaline. Usually the only way it would be excessively acidic (low PH reading) would be if it was contaminated with too much acid.
My tanks always tend to go alkaline over time, have always ended out having to add drops of acid.
Cheers
Mark
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