Last night I also sucked the layer of cyano with a 1/2 plastic hose. The gravel cleaner thign that I had was to wide and wouldn't suck the cyano up only the finer sand. But the smaller dia. hose worked well. I figure if you keep sucking it out it may come back but will eventually use up all the nutrients in the tank, and slowly go away. Thats if your not putting excess nutrients in the tank ofcourse.
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MG
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