Fire bellies do well in temps about 72-75. no heat source is needed really, in fact to breed it is suggested to put in fridge for some time before hand
Lighting is regular bulb. not too much heat coming off
I use pond rocks rather then gravel. gravel can be accidentally eaten
I have 50/50 land and water. my water levels change from shallow to deep by piling rocks. they stay in the shallow most of the time
Fire bellies like to hid so be sure to provide a covered area.
I use moss on land to keep humidity in tank and spray it daily. use water conditioner on tap water before putting frog in tank.
I only use calcium dust about once every 4th feeding but I use the orange cubes which helps gut load and calcium isn't a must.