Zorba: That's a very nice specimen of a Powder Blue Tang you have there : )
In keeping with the aquarium thing, this is a picture I took in either 2001 or 2002 (can't remember) at the Baltimore Aquarium in Maryland. They had a very cool "special" (not permanent) exhibit of seahorses, seadragons and pipefish running at the time.
This is a Leafy Sea Dragon (not a plant LOL). The "leafy" bits serve only as camouflage, if you ignore those parts and focus on the central body you can see how they are related to seahorses (the head/"snout" is in the lower left)