the best way to deal with cyano is to treat the source of the problem and not the symptoms. by increasing flow and removing any source of phosphates the cyano will stop coming back when you siphon it out.
HTH
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120S RR tank with 60G basement sump / fuge
Return Pump: Little Giant 4-MDQX SC
Water Movement: Seio 1500, (2) Hydor Koralia 4's
Lighting: 400W SE MH with 14K Aqua Connect
Skimmer: Euro-Reef RS250 with gate valve
Other: RODI, RDSB, PO4 / AC reactor
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