Should I be concerned?

[alexzandria]

I currently have a ball python, and he recently started to open and close his mouth. He does this repeatedly, and i often see him doing it while in his aquarium as well as when I have him out. Why does he do this and should I be concerned? Someone please help so I no longer have to worry!

[DaemoNox]

Are there any other symptoms, like noisey breathing, coughing, or bubbles/an excess amount of mucus? What is his setup like? His temps?