Sounds like you need to get him to vet, if you haven't already. There may be something a little more severe than a respiratory infection going on. Hopefully it isn't something to bad. Let us know what you come up with.
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2.4 dumerils boas, 1.1 albino burmese python, 0.2 bearded dragons, 1.0 german giant bearded dragon & 0.0.1 sulcata tortoise


