Originally Posted by Hurt
Since you are using Caulerpa as your macro, you certainly should leave the lights on 24/7 if you wish to attempt to keep it from going sexual. Caulerpa however has several ill side effects I am not fond of, and that is why I use chaetomorpha. Most every other macroalgae besides certain caulerpa's should be kept on a 12/12 light schedule. Most all species of macro's will suffer from a lack of respiration(night-no lights) when lit 24/7 with the exception of caulerpa's.
MichaelTX, pH drops at night, because the algae in our DT's doesn't receive light, therefore they quit giving off O2 and instead give off CO2. The CO2 rise is what lowers pH, no different than a Ca reactor. Macroalgae absorbs CO2 as it grows and gives off O2.
i had it in my old set up. never again. even though it was in refugium, somehow it made its way to main tank overflow, and was never able to get rid of it. it kept coming back. if i had advice to give, it would be switch while you still can.
