I set the tubs up with the same hides and everything uses the same substrate. The water bowls are also all the same just a plain glass bowl. The temps are basically the same as well the tubs are all 80/90 ambient around 78 usually warmer but sometimes as cool as 77. The enclosures are individually adjusted based on the animals preference all have 90º hot spots the cool surface varies between 78-82 depending on the animals individual behaviour. The ambient temps ramp from 78-84(85) during a 24 hour period. About one degree every two hours or so. The top and bottom hold and don't dip. The enclosures are all lit as well with full spectrum flourscent tubes (12/12). What the differences are I can't say but there IS a distinct behavioural change they become more shy and refusals are more likely in the rack than the enclosures. One of my older adults (10 years) looking at my records fed 28 times in 18 months in the tub and 49 times in his enclosure over a second 18 month period. I often wonder if it isn't related to light, I have a friend whom has been breeding for years and years he always says to take non feeding snakes after breeding season is over out in the sun for an hour. I found this worked for me in the past (never needed to in enclosures) I wonder if there isn't something to light exposure, there are many accounts of royals being seen warming in the evening before full sun set.