Any Caulerpa, and probably any macroalga, can go sexual. I'm not sure if its as prone as C. peltata (grape caulerpa) but this group of plants typically does it when it cant get enough nutrients for an extended amount of time.
I'd trim once a week or every two weeks, and halve the amount of plants you have, particularly if you're using for export purposes. Keeping the lights on 24/7 may be good insurance, I've never done it though.
HTH..
>Sarah