What Do You Have In Your FOWLR??

[The Grizz]

I was fortunate that the tank was drilled for both overflow & return but had to rebuild the overflow as it was way to big. I am running a Aqua Medic T1000 skimmer. It could be that your canister is pulling most of the crap out. I had both my 65 gal runnung on Rena XP2 canisters & SeaClone 100 skimmers, some weeks they would pull a half a cup full of junk and other weeks nothing.