aahhhh.... i see you dont have an overflow setup you are running a gravity fed siphon. there lies your problem! an overflow box creates 2 pools on the inside and the outside of the tank where the siphon tube between them never catches air so no matter how many time your pump stops and restarts the water will always resume flow.
check out this article i hope it will shed some light on the subject
Overflow Skimmers
and here are some to look at while reading the article to get an idea.
Overflow Box - Marine Depot - Marine and Reef Aquarium Super Store
if you are handy with acrillic check this out
DIY Overflow Box
if you still need some help (as i did) go to your
LFS and see if they have any setup or i'm sure they will demonstrate one for you.
