My 305 filter has 6 baskets and came with 3 carbon filters and 3 of the bio max ceramic rings. Now, I've heard that these carbon don't really serve any purpose at all so I'm going to get rid of these. I also beleive they remove liquid plant food. Is this the case???? I've bought some polishing pads for the top 2 baskets and the middle two baskets will contain the bio max rings. This leaves me with the bottom 2 baskets to fill. WIll I be ok with 2 more bio max rings in the lower baskets? The reason I ask is that the filter instructions say the bio max rings should live in either the top or middle baskets. I'm also having some bogwood in the tank. What do you think the best filter media for removing the wood stain in the water?? Thanks.