I plan on getting some beginner species of dart frogs over the next few months. I'm not sure what species. I have a few questions. How many can I keep in an 24x18x18 tank? I plan on making the tank a terrarium with a small stream and pond. I also have a 75gal tank that's empty. Is this too large of a tank? I wanted to make this a terrarium as well. My major concern is heat. The tank will be in my basement. During the cold winter months my basement is between 50-60 degrees. How can I keep dart frogs in a successful terrarium with those basement temps? My basement is too larger for a space heater. Thanks for your help.