Hi BrotherBoris!
Yes, it is exotic aquatic creature. It is a type of Sea Slug found in the Western Pacific Ocean.
Chromodoris willani
This species of nudibranch is named for the renowned nudibranch taxonomist Dr. Richard C. Willan. Chromodoris willani is similar in appearance to Chromodoris lochi, Chromodoris boucheti and Chromodoris dianae. This species can be distinguished by the very prominent white specks found on the gills and rhinophores.Individuals in this species can range in color from dark blue to a translucent white. All have black stripes with the center-most stripe typically being non-continuous.
en.wikipedia.org
Funny, but now the site will not let me load any pictures, no matter the size!
Longball