brown button palythoa soft coral colony, polyp move head in flow, absorb organic matter, coquina stone live rock, pet for beginner

palythoa mutuki zoanthid indopacific zoantharia zoanthidea zoanthinaria anthozoa zoanthus hexacorallia cnidarian coralimorph coelenterates coenenchyma zooxanthellae neurotoxin stinging cell palytoxin toxic poison tentacle stalk capitulum zooplankton intertidal subtidal current aquatic biodiversity ecosystem environment underwater captive wildlife aggregation lateral saltwater aquascape reef tank aquaculture tropical macro encrusting controlled conditions space blur background glass refraction propagation shallow dof selective focus brown button soft coral colony polyp move head flow absorb organic matter coquina stone live rock aquarist nano led pet beginner