sump filtration

[johnmac]

I dont know what to use for filtration in my sump, ive read about carbon and the regular filer medias, and the bio balls....So what are you guys using, is there one that I should stay away from or stear towards?? Im gonna have the tank driled out in both corners wiht overflow kits, then prob either a 25-35 gallon tank, which ever I can pick up used...I saw one sump built before with pices of plexi glass glued into place to contain the filter media, so thats what I thought I would try to do...So any ideas on what to do about the filter media??