We have a veiled, panther and a Jackson. They all using reptibreeze XL and locate it side by side. I have shower curtain to block all three sides since it very hard to keep the humidity up in Canada when we have heat on due to the cold winter. Should I still add a fan to increase the air flow?? If yes, can I use a regular household fan inside the room instead of fan inside the cage?? Thanks in advance for any suggestions.