I've seen a ton of info on building your own sump and overflow system. The only think I have not read is what the sump has to be made out of. I know it's suppose to be about 1/4 the size of your tank, bigger is better. I've seen both tanks and plastic bins used. Does it really matter? I can buy a fairly large place bin for only a couple of bucks. If it is ok to use a bin, the setup is still the same? I'm assuming you can still put pieces of plexiglass into a plastic bin.