Need help on deciding tub size.

I’m getting a 650g female soon and I’m wondering how often do females grow over 2500g? I’m currently debating if I should get an fb 40 tub or a ft 70tub. Do full grown females usually do fine in fb40 or should I go for 70?

go for the 70

At 2000 grams I house females in V70 and most female will be in the 2000 grams so I would recommend that you go with the fb70 for females over 2000 grams.