[Delphinus]

I find the explanations for caulerpa to sporulate (and the advice to prevent it from happening) to be fairly speculative. Ya gotta light it 24x7. Ya can't light it 24x7. Ya gotta prune it lots. etc. etc.

In my opinion, lighting/photoperiod is likely not really a factor. (Just my opinion, and I have nothing to back me up on that). Pruning it ... I don't know if it really helps "prevent" but it certainly does help "mitigate" (if that makes any sense). Maybe it helps prevent ... I don't know. Is an algae smart enough to know that it needs to spend energy regrowing after pruning instead of going into sporulation?

Ordinarily, a water change and maybe some new carbon is enough to clear the tank within a day or so. So expect a day where you wouldn't want to show off your tank to your friends but you'll be back to normal soon enough. You do want to watch your NO3 and PO4 because there is a chance they do go up after an sporulation event and if you have a lot of NO3 intolerant creatures (e.g. SPS) you could have a problem.

So my advice is: water change, clean your skimmer, run some new carbon. If you really want it to clear up quickly go get some filter-floss/polyfilter and try running that for a few hours.

Good luck and let us know your experiences in the end.