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That happened to me after overdosing alkalinity. It is a precipitation caused from too much alk that somehow bonds the calciferous matter in your subrated together. It can also be caused from too much calcium or magnesium. Each one of these has a balance with the other, if you have too much of one element the excess can form a precipitate.
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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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