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It's that caps, I have the same problem with my Calcium because of the caps. They just suck the Ca right out of the system.
I lowered my temp and lowered their position in the tank to slow down metabolism. Now I am able to keep my Ca around 380-400, where as before I couldn't keep it above 320-340ppm.
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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
http://www.canreef.com/vbulletin/showthread.php?t=55041
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