I'm not sure where you're getting your information mine comes from my tank. Also this reference, Sprung "Algae a Problem Solving Guide, p, 47 (2002)". Under controls for Bryopsis, the usual "strong biological filtration" and Herbivores. The herbivores listed are: Rabbitfish Diadema Urchin Tuxedo Urchin Mitraculus crab Sea Slugs: Elysia spp (i.e. lettuce nudibranch) Caliphylia mediterranea Placiida dendriticia P. kingstoni, P. virdid, and Limpapontia capitala Apologies in advance for any typos.