you can just use a 10 gallon tank as a sump ( lots of people have them or even give em away free) without partitions as I have seen, or just get some 3 small sheets of acrylic from the waste cuts at various plexiglass stores like Industrial Plastics, ( you can score them manually if you have no access to a proper saw) to make the partitioned sump.... there are lotsa of designs out. You have to get an extra amount of silicon to adhere the sides though.
I think a plastic tote box, the plastic overtime might decay and have a leak; a thicker one will be of course best. I see that King Ed uses a plastic tray for their liverock sump as well as a plastic 55gallon bin.
msjboy
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