So anyways I'm getting a 55 gal. setup from a co-worker for like $20.

The tank, stand, lights, rocks, filter, the whole 9. Overall a very nice setup.

Now my dilemma is, I don't know anything about fish.

I'm curious as what type of sharks that will stay small and can live their life in a 55 gal tank? Sharks have always been an interest of mine, and I just never assumed I would ever own a fish tank.

Also which species of shark fish can I have in the tank with each other, and are they compatible with Algae eaters?