undigested food

Hello! I just adopted a beard as a rehome and ive taken care of beardies before but I want second opinions. Birthday is unknown, The last owners had him for 2 years. They had an animal hoarding home to say the least. Now first thing I knew was he is D E H Y D R A T E D. they told me they brought...

Undigested black soldier fly larvae in poop. His lights and temps are great. He basks after eating and moves around cage as he needs. What the heck would cause this??? He is in a 4x2x2 Zen. 150w basking plus 75 basking. Reptisun t5 10.0 mounted inside. His hot side is about 100 ambient is...