A weedy seadragon (Phyllopteryx taeniolatus) in a tank at the Monterey Bay Aquarium. The background has the sort of blue wavy pattern you'd see on the bottom of a pool
Taken at ɪsᴏ 800, 30 mm, ƒ/1.4, ⅟₈₀₀ s on in Monterey, CA (SDR, ⓒ)