I also don't think the UV is going to help with your "red" cyano. I found a thread on another site a few days ago about a product called Microbe Lift Special Blend, it is a bacteria in a bottle which competes for the same nutrients as the cyano. I read all 11-pages of this thread and many hobbyiest said it worked very well. Some people posted pics of horrible cyano problems and then after pics with no cyano. However, even when using this stuff they still had to do the clean up maintenance like Ziggy mentioned.
I have been battling a little bit of cyano on my sandbed and I am seriously considering trying this. Its not a chemical and its not an antibiotic, its a Organic Nitrae and Organic Phosphate eating beneficial bacteria. Here is the stuff:
Aquarium Water Quality & Conditioners: Special Blend Water Conditioner