You certainly don't have to get a 7 tub rack - they can make whatever size you want. If you'd like, I can take a few pictures for fun of some of my bigger females in 32 quart tubs for a size reference. Personally, I move them from that size tub up to the CB70 size at around 1500 grams. Some will fit in the 32s, but certainly not all.
Side note - what's wrong with ending up with 7 snakes?!?!?![]()