Ball and corn set up questions

[Kaorte]

Jake's about 24-25 inches long and in a 10 gallon tank. I read that 24 inches is max in a 10 gallon. (ball python)

Ira (corn) is same length in a 5 gallon, we're moving him into Jake's old 10 gallon.

Zeke (baby corn) is new, and moving into Ira's old 5 gallon.

Well, length is a pretty arbitrary measurement for ball pythons. Do you know his weight? I would say at 500g it is safe to move up to a 20gallon.