[Delphinus]

It seems to me that there are sort of two reasons why caulerpa and halimeda going sexual, or sporulating, are an inconvenience.

The first is, it makes your water stinky and cloudy and it usually takes about a full day for it all to settle out or get filtered out.

The second is, the nature of the sporulating event itself. Basically a piece of the "plant" expodes (you usually just see the white or clear shell of the plant afterwards, it's no longer green). What's happened is that everything that was stored inside of this thing, is now released into the water. And that includes all the nitrates, phosphates, etc. that were absorbed during the growth process. I once had a tank go from 0ppm to >80ppm NO3 overnight, due to a particularly large sporulation event. You can imagine the stress this put on the animals in there.

So the trick is with this stuff, if you decide to have some in your tank, is to keep it well under control. Keep pruning it regularly. The less there is of it to sporulate, the less damage that can be done when it happens.

Or, alternatively, don't bother to have it in the first place. Depends on how disciplined you are at keeping the stuff under control, I suppose..

HTH ...