Just a word of caution. I originally started my refugium with caulerpa and it was doing a great job for almost a year never had any algea in my DT even if my trates were a little high. Then all of a sudden I started to get bad outbreaks of cyano and couldnt for the life of me figure out why. While this was happening I noticed the caulerpa was dying. It would turn brown and then clear then just melt away. It happened slowly so I didnt really put 2 and 2 together for months. What was happening was the caulerpa was floating to the top of the fuge and being burned by the PC spot light I had on there causing it to die and release all the nutrients back into the water causing the cyano outbreak. I ended up doing a very large cleaning of the tank sucking out all of the cyano and other detrius that had collected in the LR/LS to get the tank clean. I pulled out most of what was left of the caulerpa and replaced it with cheato. I reduced the photoperiod in the DT and increased it in the fuge to give the cheato a head start and so it wouldnt have to compete with the cyano for phosphates/nitrates. Result? cyano almost completly gone! Nitrates/Phosphates steadily being reduced. Coraline algae growing back again especially on glass. Corals, fish and BTA's looking much more happy! Cheato is growing at a good rate prune weekly. Even the cyano in the fuge is starting to be overtaken with some kind of green algae. I hope this story might help someone with similar problems. Simple and inexpensive cant beat that!