Quote Originally Posted by Jmarshall View Post
Also, I have noticed him spending a lot more time sitting on top of his hide and not inside when he used to spend all of his time inside of his hid. I do believe it was a bit hot in there for him..

If he is a bit too warm, could that cause agitation which would cause him to hiss?
If I was stuck in a locked room that was too hot, I guarantee you'd even hear ME hissing.
Does he have a cool-side hide too? (he should have) I'd lower his temps a little...& for sure check the humidity. (<that could cause noisy breathing too)