So I called ahead and the girl at keys says they have GFO. When I get there they don't have it and the guy says he has a new thing that "works just as well and is cheaper" called Phoslock?(not sure on the spelling). Its the closest place, I drove and hour, and I was excited to set up my dual reactor so trusted the guys and keys and bought this stuff. When I got home I set up my reactor with Phoslock and Carbon in them. If you don't know the name maybe you can picture it its white granuales.

Has anyone heard of this Phoslock stuff?

Also is there supposed to be a gap in between the mebia and the top sponge in my reactor or a big gap between the top sponge and the cap of the canister? It didnt say so.