"Diving with weedy seadragons is always an experience. On rare occasions we even get to see juveniles, who despite their beautiful colourations, camouflage exceptionally well," says photographer Steve Walsh. "The behaviour captured in this image is something else though. Weedy seadragons are usually solitary. Schooling behaviour like this is largely unheard of. I’m so grateful to have witnessed it. It goes to show we still know so very little about these fish."