Using Heat Tape for a Tub Rack?

[chakup]

Are their any drawbacks to using a 12qt for hatchlings? I am building my rack so that tubs are interchangeable, 6qt have a different height than other sizes so they won't fit into my set up without some modifications.

Could you do one shelf as a hatchling shelf and set to that height leaving the rest at the proper height for your plans?