Well I did the 3 days without light technique and most of the cyano is gone. All of the hair algae remained however. I have decided to change from fill it yourself RO water from walmart, to pre bottled distilled water that says 0.01 ppm on the bottle. This will be more expensive, but I will try it out and see what happens. I have also changed the flow in my refugium so that the water flows under the baffle and up throw the liverock and chaeto, instead of just overtop of everything like before (mis-read the DIY instructions).
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