If you are having a fogger in the tank it is probably causing too high of humidity which is an easy way to get and RI. And it deffiantly sounds like an RI and without vet attention(and if it's too far along even with vet attention) it will die. Best to get it to a vet right away so you can get antibiotics.

What are you using to read the humidity level? It could be a bad hygometer or jsut one that isn't working right?

You also said the humidity reads 60% but that's because you turned the fogger off. What does it usually read while it is on?