Well I differ from most people. I see people saying needs more flow - I disagree. Chemiclean works and it lasts, but it doesn't really address the issue. I've found that many times, these types of things lead to other problems down the road because the conditions that just caused them are still present. I've tried many methods/chemicals and such in the past.
My question to you is - how well does your protein skimmer work? Is it the right size? I say this because the main cause of cyano is high organic waste in the water combined with good lighting and some phosphates(which comes from teh organic waste eventually). And of course, a protein skimmer removes organic waste.
So yeah, high flow can make it go away, chemiclean can make it go away. But if it was me, I'd be looking at upsizing my skimmer and/or feeding less for a long term solution. In the short term, I would do water changes to get the phosphates and organics down in the water. Of course if you continue to feed at the same rate with the same sized skimmer, you are going to get the problem again and you'll just think the water changes were a waste. In which case, just use chemiclean and kick the can down the road to see what problem it gets replaced with(most likely lots of algae).
