i just took my approx. 1yr 8mth old bp out of his 40 gallon tank to change the water and i noticed a sort of wheezing/whistling sound when it breathes. now, i don't know everything there is to know about snakes but i do know enough. the tank temp is 78F and the humidity is 60% does anyone have any idea what this could be?? HELP!

this is the set-up i have going on......