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I have used Salifert, Elos and API for Kh tests and find that I got similar readings with all three. Since I don't really care to know to the tenth of a degree what my KH is, I've opted to use API lately for it's simplicity. I try to keep my KH at around 9-10 Kh via my API test. It's good to know that I don't need to keep it that high though.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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