The Planted Tank Forum - View Single Post - my idea for a diy drop checker, need some input
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post #4 of (permalink) Old 10-15-2013, 07:01 PM
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Join Date: Feb 2010
Location: Long Beach, CA
Posts: 3,332
That design will indicate uselessly slow. You want to maximise surface area and minimize path distance. I'd suggest you get one of those easy to read plastic ones and place it somewhere that your fish can't mess with it. Also, neither 4dkh solution nor bromothymol blue are even remotely toxic in the aquarium.
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