tub not a option, tank size?

[The Serpent Merchant]

I bought this type of tub




and this (should I get something better?)

If you can afford one a proportional thermostat is much better. I like the herpstats by spyder robotics. But they run $100 +

For $50-$75 you can get a Ranco which isn't proportional but better then what you have now. Rancos can be purchased from reptile basics.