Ok so i went out and bought the supplies that i needed and i am about to start setting this whole thing up. In a previous form i was told 16-28qt tub...the 16 looked too small (taller but not very big...length wise) even for a bp. So i went with the 28qt this one on the other hand is more shallow but longer...is this ok or should i go buy the 16qt...please help before i start drilling! THANKS!!