i raised a few in June. I have 2 Gray tree frogs that lived and they are currently an inch long Snout to Vent. what i did was use a few critter keepers, and clean the water every other day. I used a dechlorinator , since i have town water. i fed them zoomed frog and tadpole food. about 2-3 small bits for each tadpole. They do become cannibalistic, so be careful. no heat, just normal indoor temps are fine. once they get their 4th leg, you need to reduce their water and give them a place to get out of the water as Grays will drown if they cannot get out when they need to. no substrate. they can ingest it. i will post a pic of my Current Vivarium. it is an Exo-Terra 18x18x24 high. Clean water in a bowl, pothos plants are good, b/c they are very strong and also hardy.

Here is my setup, the frogs are an inch long and you can see them at the tops of the bamboo. i mist them a few times a day.