Before you rush into getting a 50 gallons tank which is over killed even for an adult and will be hard to maintain, post some details and pictures.
First thing get a picture of the snake (full body pic on a flat surface, belly pic), second get his weight.
Than go through the current husbandry
Temps, humidity, substrate used, hide used, type of thermometer, thermostat etc.
If you have limited experience do not rush into setting it up the way you think it should be set up, BP are not very forgiven with their husbandry needs and for an animal that need to be rehabbed it is essential that those needs are met.
For example if the snake is only big enough for a hopper a 50 gallons tank would definitely be inadequate.
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