I'm a weed
A juvenile Sargassum Frogfish, around 1 cm in size, well camouflaged among its host, Sargassum weeds. They are usually yellow/green/brown in colours, mottled with ability to change colours, especially dark/light shades quickly for perfect camouflage among Sargassum weeds.
The sargassum fish, anglerfish, or frog fish, ''Histrio histrio'', is a frogfish of the family Antennariidae, the only species in its genus. It lives among ''Sargassum'' seaweed which floats in subtropical oceans. The scientific name comes from the Latin ''histrio'' meaning a stage-player or actor, and refers to the fish's feeding behaviour.