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i agree with marsh, i had a hole drilled in the first chamber and i installed a probe. it was easy. makes me life a lot easier. i keep the pH constant in the first chamber at 6.7 i dont care what it is in the second chamber because i know it will always be a few .2-.5pH higher. all i adjust is the drip rate. its hard to keep it constant but its as easy as it can get.
i would also switch to the ARM course media in both ractors. thats what i use and i have no problems. it dissolves at a pH of 6.8 at a real nice rate.
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This hobby is so addictive it's almost a curse!!! I LOVE IT!
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