When i used just normal tubs before using my rack, i used heattape on a thermostat to do belly heat. Its the cheapest way, though i wouldnt stack the tubs directly on top of eachother with any UTH. A heatlamp really isnt good for tubs.
Have you thought abiut grabbing a premade rack, or building one yourself? Chris over at CSerpants makes some pretty nice ones, and if you email him about custom sizing (mine only has 2 layers instead of 3), he can do that for you as well. Mine with shipping was about $180, but theyre a huge space saver and a completely worth it upgrade if you wanna get a secondary tub, and keep them in a "stacked" position.
Another idea is using a small metal shelving unit, one tub on each with heattape underneath, that could be a cheaper rackjng system.
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