To Recap on the 3 Questions:
Q: Can you house 2 bearded dragons together?
A: Despite age, sex, or size bearded dragons should never be housed together. It is not worth putting the health of the bearded dragons at risk for the sake of your convenience. These reptiles are naturally solitary in the wild.
Q:What substrate is best for a bearded dragon?
A: For beginners, I always recommend paper towels or tile and to avoid loose substrate. They are easy to change out for cleanings and lower the risk of impaction. I will be completely realistic here when I say that it’s common for new keepers to have improper husbandry, and while their keeping techniques are being improved it is best to avoid using a substrate that can contribute to the consequences of incorrect husbandry. Never use Calcium Sand, Vita-Sand, Colored Sand, or Crushed Walnut Shells.
Q: What should I feed my bearded dragon?
A: For babies you want to aim for 80% insect protein and 20% plant matter. For adults, 80% plant matter and 20% insect protein. Fruits should be fed as a treat due to the high sugar content. Avoid processed foods such as bearded dragon food pellets and dried out insects. Great staple greens are collard greens, mustard greens, and dandelion greens. Great staple bugs include dubia roaches, crickets, silkworms, black soldier fly larvae, and hornworms. Always make sure that you check if a food is safe or not for your bearded dragon, for example avocado is toxic to them. And remember, variety is key when it comes to diet!
Bearded dragon food chart- http://www.beautifuldragons.com/Nutrition.html
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