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If I have a 28 gallon tank(only about 18 gallons of water)is it really necessary to use a skimmer if I am doing 5 gallon water changes every week like clockwork, my bioload is going to be no more than 5 or 6 small fish. Just wanted to get some input on if what I am doing will suffice or if a skimmer is needed and yor reasons why. Thanks, Joe