I havent used anything but felt, but will be ordering some mesh ones with the BRS group buy. They say they clog less often too. Maybe a small piece of rock rubble until it gets saturated enough to stay down?
My best guess. lol
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.