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PH rise

Lately the ph in my tank has risen to around 9. With a batch of homemade CO2 
it goes down to about 8.5. The tank has been set up for almost 2 years now. 
I've tried adding a little sulfuric acid to lower it and it works for about 
a week than starts coming back up again. It was always at 7.4 before this 
started happening. What could be causing this?

30 gal
75 watts of light
various stem plants, java fern
fluorite substrate
nitrates 25
kh 6
gh 12
everything else at 0
poor mans every other day
14 fish (tetras,barbs,corys)

Thanks for any help

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