Deep sea fluffies owo buff looking fluffs (to resist the water pressure), veeeeeery slow moving and slow speaking, sharpy looking teeth and spikey looking shallow fluff (with see through body!) they are not the bottom of the food chain but nowhere near the top either
Their horn is bioluminescent both to find food and to keep members of their herd feel safe in the dark enviroment
Like a kid story sea fluffs been told to have their foals from swimming too far. only to revealed that deep sea fluff speak slow and shy to upper surface sea fluff.