I used forest tiles and they come pre cut to fit the enclosure sizes. I attached mine using GE II silicone to attach them to the glass in the tanks. Moss would be hard to grown on any wall, too close to the light it'll dry out so the best bet is in the front of the tank by the doors, there's an air vent under the doors which will allow them air and moss will be on the ground which will keep them damp between mistings