Well I do like the idea of bed sheets, cheap and for onepaxk I can xover all my tanks. With the bristol board it would probably leave a small seam where the paper joins together (not a big deal, but im kind of a "perfectionist" so knowing it there would bug me), the vinyl shelving idea might work if I can maybe find a roll long and tall enough. Being the weekend tomorrow I will do a walmart run with a list of everything you have all suggested and take it from there. Im writi g everything down in a lil pocket book for my next upgraded tank so I dont forget anything I need for the upgrade.