Unless I could see something obviously wrong with tubs (which I do not) I would have an opinion on them. I do have my ball in a 10 gal aquarium, and my corn in a XL Critter Carrier (5 gallon) so I don't use the tubs. I would think that racks and tubs would be necessary with more than 2-3 snakes. I know I'm thinking about building a rack and doing the same thing. Your snakes are gorgeous, and look healthy so, I think you're doing a great job.