Deco Rock - Noise

[alrha]

Last night i put my stream into a Deco Rock, but now i hear a little vibrating noise from the pump especially as it switches from full power to lower power.
when it was hanging from the bracket, i didnt hear it at all.
it is the rock itself that is making the vibrating noise, and not anything its touching.
do you have any suggestions?

[rvitko]

Are the Streams new- say less than a couple weeks old? Usually for the first 2-4 weeks the drive unit is still wearing in and makes some noise and vibration. If it is past this time make sure the motor itself isn't touching a rock beneath it, try rotating the pump in it's position and make sure it is fully inserted into the coupler. It is also possible a small air bubble is in the drive unit cavity and will work itself out over time. I would also make sure the rock is on a solid footing and supported on all four legs. Let me know what happens- this is a new one for me. The pumps do tend to make a slight droning noise as they speed up and slow down but it should be nearly inaudible if you are at least a foot away from the tank.