New shrimp.
 

I wanted to try some of these little guys out and see if it will work. looks like some of them came with eggs.
http://i821.photobucket.com/albums/zz135/EDM95/gsh.jpg

looks like ghost shrimp? their larvae need brackish water.

Not necessarily true. There are many species sold as ghost shrimp and not all of them need brackish water to complete the larval stage. Unless you have a well established tank you will need to supplement the food supply for them until they pass the larval stage.

They are not brackish. What food will they eat?

Something pretty small like phytoplankton. Infusoria may work or even some of the First Bites fry food. In a decently aged and planted tank as long as they don't get sucked into the filter they should be able to forage for themselves. In my tank I don't do anything in particular to feed them. The numbers of them that reach the juvenile stage aren't huge, but they're definitely in there.

I'm worried they might get sucked up by my filter.

Do I need a sponge filter?

Yes! :)

Dang that because I can't get one around here.

You can try ebay, amazon, or even DIY.

You can order a fluval sponge prefilter from eBay for less than $5 shipped.
Just make sure it's close to you so it doesnt take months to arrive from hongkong, lol! :)

Maybe I can find one here. I'll call around first.

Also try by posting a "want to buy" WTB thread. Sometimes people is kind and give stuff away.
:)

Why can't you throw a nylon stocking over the intake? That's what I do and it works fine.

This would probably work.