Lighting on Sump/Refurgium?

[DanG]

if you can find a 6500k bulb, your macro will grow like crazy. Depending on which algae you're growing, you may or may not want it lit 24 hours a day, some will go asexual and reproduce like crazy if the lights go off. If you do only run the lights for 12 or however many hours a day, run it opposite of your tank so it keeps your pH more stable.