Man, NAYM, that looks exactly like my tank in my nightmares! That's exactly what I try to avoid.
I wonder why I didn't read anywhere about Caluerpa being a pest. You keep hearing - bubble algae, aptasia, flatworms, mantis shrimp, but not one word on Caluerpa. And, in my view, Caluerpa is worse: for a mantis shrimp you don't have to take the tank apart. Similarly for Aptasia and flatworms. Maybe for bubble algae, but even there, emeralds and a tang will put a serious dent in it.
Thanks for scarying my pants off.
M.