BUMP on what size tank would I need to upgrade to if I need to?
Either a 30 gallon that measures 36"L X 18"W X 12"T or a 40 gallon that measures 36"L X 18"W X 15"T. Another option would be to go with a pvc cage of comparable size.
There are a huge number of suppliers. boaphile, animal plastics, vision, and the 100s of others I failed to mention. I tend to try to buy local personally so I buy from local producers.
There is an other idea as well. the problem with tanks is the open top heat rises and humid air rises and the top lets both out. rather than restrict air flow to hold in heat and humidity turn the tank.