I just added a RIO-Seio820 Powerhead to my tank. I have great water movement in my tank now, it is a little dusty in there right now from the sudden water movement, but not too bad.

My question is, I just added some Perc to my tank and they stay at the far end of my tank away from the powerhead, is it because they are not use to the noise/tank/setup or is it because the flow is so great they can't swim in it. They are pretty small still about the size of a nickle give or take.

Thanks