Goblin Bass?

my boys are calling it "vacuum fish."

It's called a slingjaw wrasse:

This kind of fish can be colorful: http://en.wikipedia.org/wiki/Sling-jaw_wrasse

amazing!

Here's a bright yellow slingjaw wrasse pet fish:

It does not eat in this video, though.

And another:

dude, if i ever get a saltwater fish tank, i will have to get one of those!  nonstop entertainment!

Sweet. 

Note that you can only have one per tank as they prefer the company of fish other than other slingjaws:

http://www.advancedaquarist.com/2004/7/fish

awww... like my beautiful lonely betta.

Heh. You can keep other fish with a slingjaw as long as there's no second slingjaw.

Makes me wonder how they reproduce.