Anybody have any advice about the best tubs to use for this system? I'm dabbling in rats at the moment and really enjoying it. The set of 12 system would work perfectly to feed my group of snakes right now. I'm looking to build a rack soon and try and get this going, but I'm kind of stuck on what a good tub to use is. It seems like most of the standard breeding tubs are for housing 4+ breeders in a bin, and that seems like a huge waste for this setup.