My Aquaclear powerhead 30 has been making alot of noise recently. Its not really a problem now, but i'm going to have to be moving the Tank into my Room soon, and its going to definitly bother me while i'm sleeping. I cleaned it out less than a month ago after all the gunk clogged the impeller, and it stopped making noise for a bit of time, but now its returned. Any Ideas on how to stop the noise? I Bought the powerhead about 7 months ago, So i doubt its still under Warrenty.