Nitrate problems (higher than normal levels) are caused by over stocking, over feeding & neglect, period, not the equiptment. you folks who run live rock, sump & skimmer only, tell me if you kept everything the same, normal feedings etc. but you stopped doing water changes & regular up-keep for 3 months, that your nitrates would not raise, would not become an issue? I seriously doubt that & you can't convince me otherwise. if you only have 2 small fish in a 55 or larger your never going to have a nitrate problem, so that does not apply here. a filter, no matter what style, does not on it's own, produce nitrates, it requires a load put on it, if that load is excessive, so too will be the nitrates. & the statement "unless i clean it every three days" is over the top & rediculous, not even you believe that, just another attempt to slay my credibility. for shame sir, you insult my intelligence.