The reef gods have it in for me!

[Bob I]

Having put up with Cyano outbreaks in the past, I am going to put forth the theory that Cyano is just part of the maturing of a tank. I have always had outbreaks at one point of a tank's life. From all the reading I have done on it, I have come to the conclusion that excess nutrients are NOT the problem. It seems to happen no matter what one tries. Yes I advocate Chemiclean, but in a tank of Quinn's size, it would get expensive., as one package treats 300 gallons. The package does state it is safe for reefs, and I have had no adverse effects from using it. The directions state you should turn off the skimmer for 24 hours during treatment, and to do a 20% water change afterwards.
No, I am not the Calgary salesman for Chemiclean,
I am just a fan.

And BTW, I don't believe the sandbed is part of the problem. I continued using the same sandbed after Cyano outbreaks, and there was no indication whatsoever that the sandbed had died. It is (in my opinion) just part of the current fad of trashing sandbeds.