I saw this in another post and wanted to pick some brains. I'm coming to the realism that AC is not really needed in planted tanks. I know this but still use some. My question is; when stacking my trays for my canister filter, what should I use for chemical filtration if anything at all? My ammonia, trates, trites are all close to 0. Phosphate is low too. Do I need any or can I just use some sort of filter floss? I can really save some $$ if I don't need anything. I can always add more bio tho. Any thoughts?