I don't think there are any toxins to worry about but I'd probably either use smaller tubs ( they only cost about $15 right? )or just try them with extra hides in the larger tubs.
I'd be worried about pee getting under the block in the tub but, more importantly, the location of the heat sources.
Are you going to make the tub designed for full sized then block off the hot end or the cool end?
Either way seems less than ideal really.
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