make sure that rubbermaid tub is round. if you buy a rectangle it will spead on the sides as the water table rises in the tub. been there and done that, although they are cheap. if you end up buying a rectangle, before drilling holes in it, fill it up with water and let it set for an hour or so and see if that's what you want or if your ok with the results. just trying to help. good luck
350 gal. 7\'x36\'\'x25\'\'tall, , 3-400w.mh-10k, 2-6\' vho actinic, 175gal.sump, 6ft. 100gal zenia fuge,calcium reactor, kalk reactor and a carbon reactor. 7\' turbofloter 5000 skimmer.