While eco earth looks better and holds humidity better, I personally use just paper towels for substrate. In the winter I need to mist twice a day to keep a proper humidity cycle, but that is because the air is so dry. With paper towels in the summer, I just mist once in the evening.
There is a very easy way to avoid substrate ingestion with live prey around if you keep the eco earth. Just put the calcium/vitamin dusted crickets or roaches in a glass tumbler that is high enough so they can't crawl or hop out. Cresties, with their awesome sticky toes, can climb in, help themselves, and climb out. However, I feed 100% Crested Gecko Diet.
Good luck! They are addicting little guys (aren't all reptiles?)!
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