First build - needing advice

[gridley]

Thanks for the replies. My tank is 48" by 18" and 26" high. It has a plastic trim around the bottom, so I guess that answers the question about the need for styrofoam - though from what I understand, styrofoam is never a bad idea.

The lights are only 36" long and interestingly there is no indication of wattage on them. I am guessing that there are the bulbs that originally came with the tank. I'm beginning to think that I may have to add the building of a new canopy to my "to do" list in order to accomodate additional lighting.