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I had to vote other too, I have 3 I like percula clowns because they have great personality, scooter blennies because they glide over the sand, and my new favorite, coral gobies I love the way they can just stick to the side of the glass and the ones we have it's hard to tell where their eyes are because their markings blend in.
I would say most of the predator species. Especially Eels, Scorpins, Puffers, and triggers. That being said my all time Porc puffer Rex is my favorite and will always be.