I found so 1/4 inch foam at Walmart that is used for air fiilters. I cut a 1 1/2 inch strip of the foam, wrapped it around the Seio about 3 times, took it off and sowed the ends down to keep it in the correct shape. The extra foam seems to diffuse the incoming stream enough that fish don't get sucked in. Every day or two, I turn off the powerhead and rinse out the foam. Since the foam is on the outside of the powerhead, its really easy to side it off and rinse it, but the foam does act as a physical filter, so it needs to be cleaned regularly.