Is there a species of crustecians, or fish to put in a tank to breed them. Is there any way to do this quickly? I was just wondering since i dont live near an ocean and need a good food supply.

You could breed mollies and adjust them accross to salt water before feeding them.
Mollies look awesome in a marine tank, I care not what others believe BUT they are not as quick as a hungry octopus. I only ever feed a few at a time, try get a bit of variety in it's diet. Plus dalmation mollies look very cool and breed by the million in my backyard during summer.

Took the words right out of my mouth! Mollies are the way to go.

Great. Thanks a lot