Have you thought about using a plastic tub to house your new boa in? They work a lot better in keeping in heat and humidity plus you don't have to worry about glass being broken either during a cage cleaning or from a hard feeding strike that dosn't quite hit the mark. A fifty five gallon should be fine if glass is the way your gonna go but it won't last forever. Have you looked at the boaphiles yet? I think that is what I will be getting when the time comes for me to upgrade my boa to a larger enclosure.