how many ball pythons do you plan to purchase? Using aquariums may not be the best(or cheapest) route to housing multiple ball pythons. Also, 40 gallon aquariums are kinda large for baby ball pythons(but they are good for adults) and the open space can cause added stress, so be sure to put alot of hides in there. Do you plan on purchasing a thermostat to properly regulate the temperatures in the enclosure? If not, I would recommend them.