i just purchased a vision 60 tub hatchling rack and just luv it.super space efficient as the tubs are only 3.5 " high but 18" long so hatchlings can stay in there for some time.heat cable is adjustable so lower levels are same temp as upper levels.
ARS,FB,VISIONS and other open air racks need room temp and humidity control and final tweaking done by the rack itself.