what additives are you putting in?
IMHO i think that you shouldnt really be putting that many additives in the first place. if you are treating a disease, maybe you should consider a quarantine tank. if you must, and need to treat your tank with something, cut the protein skimmer for a while.
i was treatin my tank with malchilite green and i left the skimmer on, and it seems like it just went right up in that. in fact my spillover tube was clear and now it is blue.
i was told to cut back on the skimmer when putting additives in. just my input though.