stupid sand wont stop moving!!!

[Milad]

Ok WTH is going on. I flatten the sand out a bit and then it starts pilling up near the power heads. And i mean big piles, like 5-6inches high close the power heads.

And then around the rocks it goes to bare bottom. Ideas on how to keep it in one place? The power heads are towards the bottom of the tank pointed slightly up, should they be up top instead?