green button polyp soft coral move head tentacle in circular wave flow, fluorescent frag on live rock, led blue low light

palythoa grandis cinnamon indopacific zoanthid zoantharia zoanthidea zoanthinaria anthozoa tentacle hexacorallia cnidarian coelenterates coenenchyma zooxanthellae neurotoxin palytoxin toxic poison colony disc photosynthetic stinging cell pattern peaceful shape plankton feeder fauna environment underwater aggregation saltwater aquascape reef tank aquaculture tropical exotic commensal encrusting controlled conditions explore pet shop invertebrate propagation shallow dof bottom glass refraction animal wave maker pump canister filter sump