Just built these two stacked racks a couple of weeks ago for under 100 bucks, heat and dimmers included. 16" wide melamine shelving and a table saw. Heavy stuff so I built ten tub units and joined them after carrying them inside. I left the front shelves long so the tubs would go outside of the enclosed sides to give a better cool spot and gradient. I used cereal box cardboard as a spacer when screwing in the shelves so there is no chance of escapes unless you don't push a tub in all the way. You could of course use a couple of larger tubs and space the shelves accordingly. When using larger tubs for larger snakes I use quarters at all four corners for spacers. Peg board on the back with 11" heat tape that is hooked up to a dimmer switch. Each ten tub unit has its own dimmmer so I only have to heat what tubs are being used. Cheap, effective, and escape proof if done right. Photos in next message. Another option is to buy a nice rack which I do also but they are pricey. I do prefer belly heat but that is a lot more work and these racks I built are for hatchlings that will only be in those tubs a short time. Hot side 86 and cool 72. Not bad.

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