https://redseacreatures.com/taxon/fishes/bony-fishes/pipefishes/rock-pipefish
Rock Pipefish (Phoxocampus belcheri) | Red Sea Creatures
This pipefish went dark and moved inside the reef - color is irrelevant in a crevice, and the only bright thing on it is the tip of the tail.
phoxocampus belcherired searockpipefishcreatures