I have the following in my canister filter, i think it's in the right order
Bottom tray is wool and ceramic (full)
Middle tray is bio balls and wool (full)
Top tray is wool and carbon. (full)
I am going to remove the carbon from my top tray today and replace it with Purigen, however that would leave the basket more or less empty... Should i fill it with wool or what?
I think the trays and media are in the right order, but what do you suggest i do with the top tray?
Thanks in advance