I really would need to know what kind of filter you have.. this is what I have..
See where the intake is.. at the bottom? Well what I do is take the pantyhose.. cut 4 in from the toe.. then just slip it over the bottom like it was a foot.. they pantyhose stay there without tape or anything and you want to be able to take it off to rinse it when you do water changes or it can get clogged.
Here is what mine looks like (you can really see it in this pic but I lighted it so you could see them clearly... it also needs to be cleaned.. sorry)
What kind of filter do you have?