I did the exact same thing a couple weeks ago. seems to be working really well for me at least. I did bottom 3 racks ASF's and the top 4 rats. I like to keep everything on one watering system just for my own ease of maintenance. I flipped a couple 2 x 4 blocks and it doubles as a riser and a chew block. I used the lowes tubs and they haven't started to chew anywhere YET.