Future Caging Size

So, my snake is currently in a 20 gallon aquarium

I have the opportunity to acquire an aquarium with the following dimensions:

36" long
18" deep
13" tall

Would this be a suitable aquarium for Mycroft as he gets bigger??
Currently he is about 500g and 2.5-3 ft long

thanks

Short Answer: Yes.

Explanation/long answer: Those are close to the dimensions of a 40br tank which my 3.5ft 1500gr Petey is in. I believe that size and similar is around the recommended size for an adult BP, but don't quote me on it.

If I get it, when should I upgrade to the bigger cage??
I don't want to stress him out too much...