Pachyclavularia(reddish-purple mat with green polyps) can inhabit both low level and intense lighting arrangements. If you have detritus or algae on the mats they will not open up. they will also not open up if their are Aiptasia anemone's or strong toxic corals with sweeper tentacles such as Euphyllia and Catalaphyllia. Too much iodine will also impede the polyps from opening up.
One note: Briareum(Gorgonian) that BRUCE mentioned is alot of times associated or called the same thing though they are different in nature. Briareum shed mucus sheets and send vertical projections from the mat whereas Pachyclavularia just forms loose folds. Moreover, Briareum has sweeper tentacles, Pachyclavularia does not! _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |