To be honest, you could go to Lowes or Home Depot and buy two Rubbermaid containers (or something like them) and it would cost you less than 20 bucks. Better yet, just buy one 20 or 10gal container and get a 5 gallon plastic bucket for the other container and then you have yourself a sump. You water would overflow from your tank into the bucket and then overflow into the container. From there your water would be pumped back into your tank.