I had a Cyano problem a bit ago and used Chemi-Clean. I had to do a second treatment a week later and have been Cyano free since then. Good luck.
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90g mixed reef (eventually!); 23g sump; 20g QT; Waveline DC-5000 return; 2 Radions; 2 Vortech MP10s; Koralia 3; ELOS ATO with 14g ATO tank; RLSS R8 skimmer; BRS reactor - GFO/Carbon; filter socks; Puratek RO/DI
http://www.canreef.com/vbulletin/showthread.php?t=85303
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