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#5
09-29-2012, 07:13 AM
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pH pens are a total pain. Caused me an heart attack one day when it showed my pH of something around 6.8 after the lights are off (I was like how is that even possible in a saltwater tank!!!!). API test kit saved me from dying. I got mine from ebay for like $10. Guess the expensive ones are of no difference.
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