Ive been using a penguin 330 for about 9 or 10 days, and the other day I noticed it slightly spilling over in the middle. I thought it might have been from clogged media so I rinsed the filter pads and floss out, but it still spilled over. So the I took the pads and media baskets out of the filter and it still over flowed. Just about the only thing I havent done is took the filter apart and put it back together again. If anyone else has had this problem and fixed it I would like to know how.