ok......lets start thinking in a different direction here....lets stop trying to "band aid" the problem and try to figure out whats causing the problem
.....cyano is caused by 1 of three things.......an excess of nutrients (so we look at our bio-load and what and how much we are feeding)......old bulbs (as bulbs burn the drop in "K" value, becoming closer to that of natural sunlight).....and lack of flow (which can be corrected by either re-directing or adding more flow)....
CS is not a cure all when it comes to cyano or diatoms, but it does seem to help (for me anyway) some of the other benifits are as stated, water clrity and also it acts as a biding agent for foods that will either be skimmed out or assimilated (KZs words),,,,,I try to steer people away from "chemical" solutions before trying to figure out whats causing it
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694