Being brand new at this, I've been looking at the equipment used for sumps, trying to figure out if I could make one cheaper than buying it. I think I'll be putting it in the basement so space isn't an issue, although it seems I'll have to insulate it. My question is, what is the importance, if any, of using a clear material for the sump? Other than needing a clear top for light to the refugium, is there any reason I couldn't build one out of just about anything that will hold water and equipment without contaminating it?