I don't have a rack system yet, but I keep all my animals in T8s right now no matter their size. I just keep it cluttered up with fake plants. As they grow I slowly take decor out. My big male now just has a waterbowl and a tub now while the girls have fake plants and some have a fake tree branch. I got my leo girl when she was around 80 grams so she had a 2'x2' enclosure to herself and ate as long as the enclosure was kept cluttered.

I see crumpled newspaper and hides recommended a lot for hatchlings in tubs and it's what I plan on using too eventually. Having tons of fake plants for a rack system wouldn't be very economical.