I would not put my tubs that close to the heat tape but if you do you will want to test it for awhile to make sure the heat that close doesn't dry up the humidity in the tubs.
Stacking is no problem just make sure there is adequate airflow to circulate the heat.
If I was to add insulating to a cooler it would be on the outside though...
When did Pepsi start making Budweiser Dave?
Nice incubator
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