A Couple of Ideas to Think About as You Care for Your Tadpole/Frog:
Try to gather extra water in a bucket from the water source where you caught your tadpole. You can use your water to clean the tank as needed. Tadpoles don't do well in tap water...the chlorine doesn't agree with them
Try to release your frog in the same place that you caught your tadpole---not always possible if you caught your tadpole in a seasonal puddle that drys up.
Not all of your tadpoles will make it to frogs. This year we had a tadpole that was cannibalistic...something we had never seen before. No matter how much food we put in the tank Lunker would be caught eating other tadpoles. He was a large tadpole when we caught him so we will avoid catching extra large tadpoles in the future.