You are going to be even more upset when you find out it is a lot easier and cheaper to keep them in a tub without all the lights and what not. Costs me between $8 and $15 depending if tubs are on sale to add a new animal to my system. The biggest expense is the thermostat at the beginning.
You learned a lesson the hard way. Hopefully you caught the mistake soon enough. Always research an animal before purchase. Never expect a retailer to tell you the right thing. They want to sell equipment and generally are unwilling to pay qualified people to work in their stores.