Check out your local used building supplier or, in season, yard sales to find an old storm window of suitable size, $5-20. Cut the glass to the proper dimensions of your tank, being an eighth of an inch shy on the width. Cut the glass in half and silicone a strip of tire tube (well washed, inside up) along the cut to act as a hinge. Silicone a marble or seashell onto the front piece to use for a handle. For lights, use a piece of raingutter with 2 endcaps for the housing, paint the inside white, and mount a vho or pc flourescent light and ballast. Not counting lights, you should be able to set up both for under $40 and a couple hours labor.