The only 2 things I know of, that would be negatives to watch out for with tubs, are that it can be hard to get your ambient temps up and stable, since plastic looses heat faster than glass, and that you'd want to go with a low wattage UTH so that if it even malfunctions, it won't get hot enough to melt the plastic. I've heard many recommend ultratherm heat mats (I know reptile basics sells them, not sure who else). These are also pliable so would fit a tub easier. When looking at your tubs, try to find one with a smooth / groove-free inside to make cleaning easier.
You might want to check on the DIY and /or caging forum and see if anyone's posted about insulating a tub to help hold heat.
Good luck!
Artgecko








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