Well at the moment, Jazzy is in a 1liter little bowl, changed weekly with a dechlorinator (and keeping a healthy amount of his 'old' water with his slime / bacteria).
Chubsy is in a 1 gallon for my dorm-duration. Once I get more snakes, I will put Chubs in one of the tanks (as I will one day switch to tubs for the snakes, except for 'pet' snakes which will be in decorative vivs), and have ample room to grow.

For now he is smaller than an adult Betta, so the 1 gallon tank is a lot of room for him! I have no intention of keeping him in a 1 gallon for his entire life.
We have had Jazzy for almost a year, and he's been doing great with how we have kept him!

Before when we had kept bettas they died within a few months. Now me, being a nerd and older... Researched them and he's been doing fantastic because of it.
Any tips will be fantastic though. I want them kept healthy as can be!