I currently have my three BPs in a RBI CB-70 rack. The rack uses Iris CB-70 tubs which, according to RBI, are roughly 31 quart (Is this correct? Sounds too small a volume for a 17x33x5.25 tub). I'm starting to think that these tubs will not be large enough to accomodate my BPs (particularly my female) as full adults along with two hides and a water bowl and a small humidifier.

Anyone have any thoughts/experience on whether these will be large enough for my adult BPs and does anyone use the 58 quart (14.5 gal.) Iris tubs? The dimension is 20"x39"x6.5."