Congrats on becoming a frogger. I love grey tree frogs. Two frogs in smaller tank is fine. I put in a layer of rocks, layer of coco fiber, layer of bark chips and then place smooth river rocks and a piece of wood, plus some plants. I buy tropical plants at a local nursery and wash them off, potting soil and all. Native frogs are a little more tolerant of their environment. I pour declor water up to level of rocks, let it set for a couple of hours and then refll it. Handle them as little as possible. Tiny froglets need to be picked up in a tiny plastic container when moved. Or on the twig they are clinging too. They leave their setup alone except for spraying to keep the humidity about 75%.