I got the cf1000.
I throw the plastic bio balls away.
The Bottom tray has the blue sponge(coarse one) followed by Ceramic noodles. The idea of the sponge first is to diffuse the water flow before it hits the noodles.
Top tray has the Black sponge(fine one) followed by filter wool. If I am using carbon, I put it inbetween the black sponge and the filter wool.