At this point I wouldn't worry if there are no other symptoms. A older lady (70 yrs old) lives a couple miles from me that has 14' Coastal's. She has raised them from Hatchlings. She loves to help people and answer questions. Look her up on YOUTUBE. She answers all comments ect.. Her youtube name is 1softkiss. I'll post a couple links to her for you. https://www.youtube.com/watch?v=GWp8qCglRPQ
I honestly didn't read everything but what kind of enclosure is he in? Could it possibly be from lack of muscle tone? I know I've seen a few carpets that do not have things to climb on and exercise because they are in a rack system and they seem to have decreased muscle tone from it.
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Ball Pythons:
0.1 VPI Axanthic - Zoe
1.0 Pastel - Nero
1.0 Normal - Dmitri
1.0 Spinner Blast - Dizzy
Boas:
0.1 Red Line Hypo BCI - Sophia
0.1 Normal - Sonia
Amazon Tree Boa:
0.1 Red Phase - Athena
Carpet Pythons:
0.1 Coastal - Isabel
0.1 Tiger Jag - Lily
0.1 Coastal - Aria
1.0 Axanthic Coastal - Xander
Corns:
0.1 Albino - Ezra
1.0 Normal - Loki
Hognose:
0.1 Axanthic - Mira
African House:
0.1 Normal - Nyah
Leopard Geckos:
0.3 Daisy, Ophelia, Amelia
Bearded Dragons:
1.1 Ruth, Mushu
Cats:
2.2 Wesley, Leo, Smoke, Buttercup