Welcome to Frog Forum. And glad you posted all your questions in one thread! I can't answer for the substrate as it will differ from one frog species to the other. Same for the thermometer and hydrometer. I use bot on almost all of my tanks. I know pacman frogs need good warm temperature. So a thermometer will be very helpful!
You'll soon have other members answering you for the remainder of your questions.
Eric






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