09-29-2010, 06:23 AM
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Hi John, I've had some green cyano growing on some of my rock. What I've been trying to do (it's a pain because I have to take the canopy and light fixture off to access the tank) is vacuum it off when I notice it accumulating.
I use a tube, a mesh bag, a bucket, and a rubber band. I put the mesh bag around one end of the tube and secure it with the rubber band. I put the other end of the tube in the tank, start a siphon from the end of the tube with the mesh bag in it, drop it in the bucket, and then use the suction to vacuum the cyano off of the rock. It won't clean the rock entirely, of course, and it will only come back if conditions don't change, but it appears to get rid of most of what's there. The mesh bag traps the cyano so that afterward the water in the bucket can be returned to the tank. Give the mesh bag a rinse in the sink afterward and it's good to go for next time.
I would imagine that what I've been doing is better than using a turkey baster to blow it off the rock because this exports it from the system altogether whereas blowing it off the rock doesn't remove it from the system and may allow it to take foothold elsewhere.