snails are your friend
I have JungleShrimp's version on every power and canister filter I own. They aren't too bad to clean except when bits of java moss get on them, so far regular tank mulm and such rinse right off. I have an Aqua Clear 20 on a 5 gallon that's thick with shrimp and believe if fry could go through it my population would not be nearly so high. Can run take a picture of a dirty one if anyone wants to see. They do gunk up every few days in my own tanks.