Had problem with fry getting sucked into my filter. Took a plastic crystal light container and perforated it with many 5/8 inch holes. Drilled the top out for a snug fit to my intake tube. For my fluval 304 filter that was a 5/8" hole. Put a 4x12 media bag around container and trimmed it to about 1/2 inch above rim. Folded into container and placed top on. Just slide intake tube thru top and put in tank. No more fry in filter with