ok i just got a emperor 280 and it seemed quiet for a while but now it makes a mechanical noise i have rinsed the impeller cleaned the inside of the filter with q-tips and all that its still noisy and its annoying because its in my bedroom is this regular for emperors or not i did used to have sand in my tank is there any mods i can do to make it quiet (sorry if this has been posted before i searched and found nothing so)