Lance, IMO caulerpa is not the way to go. Although it functions well inre to nutrient consumption, it can be extremely invasive if it gets into your display. I would prefer chaeto only. Most people would probably tell you a mix is best, and I would agree that diversity probably is best. But if you every transfer anything between fuge and display, the caulerpa can catch hold and it is a nightmare to eradicate IMO.
BTW, I have both in my fuge.
Garrett.