After much thought I have decided to move my 150 gram pastel ball from a glass tank into a tub. Now for the questions.

1. What is the best tool for putting the holes in the tub?

2. How big should those holes be?

3. What size UTH would I use for a 15qt? a 28qt? a 42q?

I am also going to get a thermostat the question is which one? there are so many?

I have narrowed it down to either:
1. Alife thermostat
2. Big Apple's BAH -1000SC

Which would you choose?

Also, the holes I put in the tub would they be different for a baby corn snake or would they be smaller?

Thank you for all help