The hatchling tubs often need holes or excess condensation can build up since they are more humid and warm.
This is an Animal Plastics economy line rack. They are good if the rack will be in a warm room. See the flexwatt along the back of this shelf? It heats half the tub for the hot side.
The big racks that take the 41 qt tubs don't really need holes. They are so long that holes can allow too much heat and humidity.to escape if they are not in a warm room.
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