New Tub, How Big?

my BP is a little over 30 inches long, im gonna switch to a tub and gettin it tonight when i run to walmart, how big should i get, they have some that are around 36x18x9 l-w-h should i get that big just so hes got room when he gets bigger??? if not what size should i get? thanks for the help...

leaving in 5min no opinions???

I'm using a 28 quart tub for my BP. He's only 23", though. I think once people graduate from the smaller tubs, they use a 40 or 41 quart? That's a long way away for my little one.

Don't know if it is too late but go with the 41 Quart at this point, plenty of growth room then. :D