When will it stop ????

[Sam1969]

I have been battling all kinds of algae for months now ... have got the hair algae beaten .. phew .. and most of the other algae is now beaten or under control .. but I now am having a problem with what I think is cyano, it starts as a reddish brown coloring on my sand and then as time goes on it turns to a darker red then to a brown.

I have been doing large water changes once a week ( 50% on main tank and 90% on sump ) for 3 weeks now and its not getting any better in fact my anemone is looking very sick and starting to turn green on some of his tenticles. I am very concerned and wondering what else I can do to beat this before it kills my anemone.