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This may be a stupid question, but how important is it to have a protein skimmer? My 150 has been set up almost a year now and I can't seem to keep any other fish except for the first 4 fish that I got. They are a foxface, racoon butterfly, coral beauty and a choc. chip star. The latest casualties (there have been many) are a naso tang, percula clown, and blue hippo. Could the lack of a protein skimmer be the cause? By the way, water parameters are amm-0, nitrites-0, ph-7.8 and trates-20.