I used Chemiclean too - with great success on my 135. No problems with anything except the Cyano.

I was very reluctant to "throw in the towel" and try a product like Chemiclean, but I was also very frustrated by the Cyano - I was sucking out huge quantities weekly with my waterchanges, but it just kept coming back as quickly as I could get rid of it. I replaced lights, modified my husbandry, and none of it made any difference. My vision of a beautiful tank was transformed into this nightmare of a tank covered in red. The cyano killed several corals and zoos. My frustration level was extreme. I finally tried the Chemiclean in desperation, followed the directions "to a T", and 3 days later - no Cyano.

It seemed to be what I needed to break the cycle of the Cyano. It was totally gone for about a month, then started to come back in a very minor way. I never treated it again, and just kept up with my routine of waterchanges. After about another four weeks of very minor visibility, it disappeared, and I have not seen any signs of it in the last 6 months.

In minor cases, I would agree that siphoning, water changes, black-outs etc. are the way to go. But if it gets severe enough, you need to "knock" it back. For me, Chemiclean did that very rapidly and effectively. The fact that it didn't ever come back as significantly indicates to me that there was not really any big problem with my feeding regime or husbandry. But I would suspect it would have taken much longer to get rid of it without the chemical intervention, and that there would have been more "friendly" casualties along the way.