Don't Panic.
What are you using to measure ph? Before taking drastic measures, I'd be sure you have a correct reading. pH 8.5 is not deathly critical but not something you would want to sustain longterm. Try to use another test method or kit to confirm. If required CO2 could be used to lower pH but you need to be careful to do it slowly over time. I have heard of some people using soda water in an emergency.
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New!! 150 gal. wt 2 x 250W 10000K MH & 4 T5 Actinics.
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