[HighlandReefer]

Percula9,

It's interesting you bring up iron dosing. From other threads, I have read that many hobbyists feel that dosing iron will increase cyano problems. There are lots of documents that indicate increased iron levels leads to cyano and algae blooms.

I am not sure how changing to a reverse light cycle in your refugium would aid in controlling cyano. In my refugium with a deep sand bed, I have quite a bit of cyano growing. I am going to clean my refugium out, turn of the lights and just maintain the deep sand bed as The Fatman has recommended. When I first started my refugium with deep sand bed and no lights or macro, it did reduce my nitrates compared before I put in in-line. Since I have lit my refugium, I have nothing but algae and cyano problems.