Yeah I ran the same configurations and wasn't crazy about the lighting with the Aquasun. It seems to wash out the colors of the corals. I ended up running a stright split of 3x03 Actinics and 3x 50/50 Actinic White.
I would think the increased growth of cyano has more to do with the increased intensity of the light rather than spectrum. But it might make an interesting experiment to adjust the spectrum to more blue than red and see if it has effect on cyano growth before adding the other cuke. It's been so long I can't remember which I did first (change the spectrum or add the cukes) to recall if there was any correlation to one or the other.
I would think the increased growth of cyano has more to do with the increased intensity of the light rather than spectrum. But it might make an interesting experiment to adjust the spectrum to more blue than red and see if it has effect on cyano growth before adding the other cuke. It's been so long I can't remember which I did first (change the spectrum or add the cukes) to recall if there was any correlation to one or the other.