Filter socks in an aio?Depends on the tank and your budget. InTank Aquatics makes ALOT of stuff for AIO's. Lot of media baskets and stuff that work for almost every AIO out there. They also make Fuge baskets and sell the corrosponding Fuge Lights that work for AIO's, so you could do that as well.
Common setup I see is Filter sock into Media basket loaded with something like Filter Floss/Carbon/GFO, into AIO Skimmer, into return pump.