Blue Dragon Sea Slug. No, this is not fake. These are beautiful, I would keep one.
A blue sea slug tiny and dangerous-quite an interesting story. Click on the picture to read it.
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Glaucus atlanticus. This nudibranch is distributed throughout the world's oceans, in temperate and tropical waters
The Blue Angel sea slug, eats poisonous Portuguese Man o'war tentacles concentrates the venom for it's own use and becomes more deadly than it's victim.
Meet the blue dragon — probably among the most beautiful animals on the planet. And he's a sea slug, no less.
Glaucus atlanticus by Wang, TC, WJ, Chen & Robert via World Register of Marine Species (cc-by-nc-sa)
nudibranch (sea slug)
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The Glaucus Atlanticus is my favorite animal, but it cannot be kept in captivity because it eats Portuguese men 'o war, and thos are much larger and harder to keep.
The Blue Dragon (Glaucus atlanticus), one of the world’s rarest and most beautiful mollusks.