Suggestions for making water more acidic?

["Sandy Erickson" <sandy00@earthlink.net>]

Hi all.  I've got a pair of p. pulcher in a tank iwth pH of 7.4 and GH 5 dH.
I have read that I might increase likelihood of breeding by making the tank
slightly more acidic.  Am wondering if there are any safe ways to do this
other than CO2 injection?

Any other suggestions on how to safely lower the pH?

Thanks.

Sandy



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