Fish tanks with the lids are not escape-proof even with the metal spring clips. I had two ball pythons and a king snake go on unauthorized slither-abouts before I ditched the fish tanks and got proper reptile enclosures because they pushed past the clips.
If money is an issue these are cheap, secure, and retain heat and humidity better than any fish tank:
https://www.lowes.com/pd/Hefty-25-Ga...Lid/1000505547
Combine it with a UTH on a thermostat and it's fine.