I have kept both chaeto and caulerpa and never had a problem with caulerpa going sexual. I think the trick is to run runs 24/7 in your fuge. Chaeto is a great macro, but caulerpa makes a better fish food. Only my foxface will eat chaeto. Feather caulerpa is supposed to have some anti-ich properties. My fuge has a mixture of chaeto and feather, maiden's cup, and bubble caulerpa.