6 quart would be better for hatchlings, they'll feel more secure.
These two companies make pretty good racks:
http://www.animalplastics.com/
http://www.reptilebasics.com/reptile-rack-systems
And for specifics, this rack could hold hatchling tubs and juvenile tubs:
http://www.animalplastics.com/Iris/375.htm
And adult and juvenile tubs:
http://www.animalplastics.com/Iris/cb70.htm
They also have a wide variety of racks (AP) and they can also come in open sided versions.
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