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First off I'd like to note that if is black cyano you have a bigger problem than you think. There was a forum a while ago about cyano that was left unchecked, it began to turn black when the bacteria started to die. This could crash your tank.
In addition to skimming well and siphoning, you might also try "Red Slime remover" which is a powder you can mix and add to the tank to rid it of this evil infestation.
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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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