upside down

So basically I've heard that water pumps should be "fed" the water, rather than have it pull up the water it needs every time it turns on. However, since the input is at the top of the pump I was wondering if I could turn it upside down (to make the water input lower). Would this potentially...

Is it normal/okay for my cham to sleep hanging upside down? Do you think he will fall? Should I wake him up and move him? Thanks to anyone who can help. -Christie