Overall a good product that is worth the money. My problem arose when I added the solution. I added the solution and set the CO2 at 5 bps in a 40 gram tank. No change after 5 hours, still blue. So I switched the solution I had left over from the Fluval drip tester and sure enough it turned green after 2 hours. contacted her 2 days ago. Still no reply, I will change my rating depending on if/when they reply
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