Not real sure on the time limit, though people have had success with just a 12/12 cycle, so I doubt thats a huge issue, do you have a lot of power outages? I light my caulerpa 24/7, and prune weekly, both are supposed to keep it from going sexual, though theres really no gaurantee. I know there are risks, but I've had 0 nitrates since adding it, I just can't let it go. Some argue that the DSB
is just as effective once properly established, I just can't see that though. I'm using 40 watts NO
flourescent on a 20 gallon tall made into a sump, and the stuff is growing like crazy.