Try a rubbermaid sump with a smaller rubbermaid container to put inside(drilled with a few holes on each side) to act as a refugium... get a small mv fixture for the light and some extra macro from a local reefer. Bare bottom or DSB is just a matter of opinion(I like a very fine grain 6-7" DSB). Any submersible pump will do as a return as long as it will move, at least, 10X's the total water volume of the entire system. Cheap, reliable skimmers can be found on Ebay(turbo floaters, etc) or get some plans and build your own.