Walking pump's killing my new sps

[kwirky]

I added my first SPS to my tank (pocilipora) and for some reason the maxijet on the one end of the tank is now walking across the tank and stops RIGHT in front of the colony. It's killing the one side of the colony.

I'm using the little hanger with the single suction cup to hold the pump, but I think the vibration of the pump is causing it to slowly slide. I can't think of how to keep it fixed in place, or what's causing it exactly to move

For now I turned it's output so it's at a slight angle and hopefully it'll blow it in the opposite direction instead of straight into the colony.

Death by squirt gun!