I would ensure both of them are eating the CGD. Insects are great for getting them to gain weight but are far from a complete source of nutrition. I always feed fresh CGD every other day until I notice they are pooping regularly, then I feed insects once weekly along with their CGD. They eat very small amounts, sometimes its hard to tell if they've been eating. Sometimes the only way to know is by seeing the little turds, especially with smaller geckos.
I've never bought a KK so I'm not too sure on what the different sizes are. I always stick to tubs for hatchlings-sub adults. 6qts for small hatchlings up to 8 grams then I move them into a 16 or 24qt tub until they reach anywhere from 15-20 grams, then into the display enclosure of at least 10 gallons, but I think the R-Zilla Atrium is around 18 gallons which is perfect in my eyes for a single crestie or gargoyle.
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