This is good advice, but you could have even more options if you went with a rack sized for the short V-35 tubs. 2 V-18 tubs will fit in the space of 1 short V-35 tub. I have adult males and almost breeder sized females in short V-35 tubs. I really like the flexibility of being able to switch between short V-35 tubs and V-18 tubs.