A Large Mouth Bass is eventually going to need a very large tank. They are pretty fiesty fish, I've read and so they need their space.
30 of them, well that is a pond.
You really don't need to release fish back into the wild (its illegal someplaces anyways), so you'll need to figure out what you are going to do with them real soon.
A 55g won't be a long term home for them all. Start digging that huge backyard pond!