I have a 29g tank that could be used. I think Joel has one with baffles already in it. Check the for sale section. He has one listed that would be more than enuf for your 55. If you want to install baffles yourself and make your own I have a standard 29g in excellent shape. You can customize it to your needs. Let me knw.
I have a aquaclear wet dry filter in good shape rated for a 200 gallon tank. I live in waterloo IA and would like $150 for it