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Bev's right, water changes can't maintain your levels. Considering that if your calcium is at 320 ppm, and your new salt water measures 380ppm. If you are only changing 15% it won't raise your tank levels back up to 380. (just and example) I drip with Kalk weekly between water changes, Kalk is the most cost efficient calium additive for low to medium tech reefs. I also dose iodine, magnsium and strontium weekly as recommended in the instructions because I don't have tests kits for those elements. I consider that the instructions are pretty accurate for my bio load.
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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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