I have 2 baby pacman frogs in a 20H gallon aquarium, split with a divider, and an under tank heater to provide heat and humidity to the tank and substrate. My problem is, that the tank is very warm and humid- but after a few weeks of cleaning the entire enclosure (sanitizing, removing all artificial plants, and completely changing the bedding (exoterra plantation soil)- I get tiny white little bugs that I can see crawling around the tank!! They don't seem to harm the frogs but they're disgusting, and I don't want the frogs to live in an unhealthy environment. This has happened twice now. In addition, there seems to be a little bit of white mold on the terrarium moss (also exoterra) due to the warm/humid conditions of the tank. Last time this happened, I completely replaced the moss as well. What are these white little bugs/mite things? Are they harmful to the frogs? How can I prevent this from happening again? How can I prevent mold from growing on the moss? Any and all help would be greatly appreciated!