In the
refugium there is a double flourescent hood. Each is 18 watts, one white and one blue.
I used to have Caluerpa in that tank when it was my only tank, and they grew like weeds.
In the display tank I have a 24 watt compact flourescent. I have been leaving the
refugium lights on as much as possible and limiting the display tank lights to 6 hours a day.
The hair algae is significantly slowed down -- I manually removed a lot of it and it doesn't seem to have grown back.