What is the definition of Crystallichthys?

Ah, Crystallichthys! Now, imagine this: it's a fish so rare, it's as if someone had taken the most artistic and meticulous approach to aquarium design. It's like finding a unicorn in a fish tank, but instead of sparkles and glitter, it's made entirely out of shimmering, iridescent crystals that catch the light in a million tiny diamonds. They're so unique, they'd make a crystal ball jealous – but only of fish.

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Now, here's an edgy sentence: "The lighthouse keeper found Crystallichthys in the ocean, and decided to use it as the centerpiece of his 'Mirage' restaurant, claiming it would 'crystallize' the dining experience."