What substrate is he on? Temps? tank type and size? How big is he/she? How long have you had it? Did you try waxworms or small silworms?

I wuld take it to a vet, he may be impacted...

BTW, this forum is DEE EE DEE DEAD!
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0.0.1 Chrysemys picta picta (Eastern Painted Turtle)
0.0.1 Teliqua gigas (Indonesian Blue Tongue Skink)
0.2.0 Eublepharis macularius (Leopard Geckos)
0.0.1 Nerodia sipedon (Northern Water Snake)
0.0.2 Rhacodactylus ciliatus (Crested Geckos)
0.0.1 Python regius (Ball Python)
?.?.? Assorted goldfish, minnows and guppies
1.0.0 Ferret
1.1.0 Cats
1.0.0 Aussie Cattle Dog/ Border Collie Mix