Blue Line Trigger (Indian Ocean) Groupers Demosponges such as this are

Demosponges such as this are comprised of silica spicules which may be extremely irritating if touched

which will surely damage the colony

however its colors are more intense

and a single horn extends from its forehead reaching at its longest to the mouth

scolymia corals are able to expand their tissues to a surprising size

Blue Line Trigger (Indian Ocean) Groupers Demosponges such as this areTriggerfish are extremely personable and entertaining, and make great tank mates with other fish of similar size or temperament. They will eat invertebrates, especially shrimp, but also other crustaceans, mollusks, bivalves, sponges, tunicates, feather dusters and more. They may move and flip over rocks to search for food underneath. They do not typically bother corals. They may chase and bully other fish, especially those smaller than themselves.