Jumping spiders are harmless. They are the only spider that is allowed to live in our house. They're cool little spiders IMO, and for me to say that... You know.. Cause I'm deathly afraid of spiders and most are KOS... Our jumpers like to sit on the heat lamps of our tanks, they don't bother the snakes... I doubt that the spider even care about your snake, as long as he gets a bit of warmth from the lamp.