starting from the bottom a fine blue sponge then a gap then a course blue sponge then a green nitrate sponge then black carbon sponge then on the top a white disposable floss
what i did was 2 coarse at bottom 1 fine blue 1 green then white pads but i dont think this is correct
You normally have a fine blue sponge at the bottom, then two coarse blue sponges, then a black carbon sponge, then finally a white polypad. You can replace the top blue coarse sponge with a Nitrate Removing Sponge (Green) which Juwel have recently bought out. I have a Rekord 96 and that's how my sponges are, don't know if it's different in different size tanks. I'll find out when I get a bigger one!
I have a Juwel Rio 180 & the instructions are; fine blue, ( 2 of those in the bottom basket ) coarse blue, nitrate remover, ( green ) carbon ( if used ) & white floss in the top basket.
In my instructions it quite cleary states that the fine blue should be at the bottom, the the coarse the the carbon (optional) then the white floss. I don't use any nitrate sponges.