An under tank heater is the best for heating! This will help with humidity and a large shallow water dish helps! Also no one mentioned the temps, cool side-80 and warm side 90. Try to get the temps as close to this as possible. They will go up and down a little but don't worry! Also I like using coconut husk for a substrate but that's a personal choice! I also use a 20 gallon tank with no issues!