While I do not use the Fluvals I have found that by pushing water into the filter with a powerhead or hose to be very effective. It forces the air out so the filter can work. o Mike Nielsen u m Department of Geography THE OPTIMIST BELIEVES WE LIVE IN ? a Harvill Bldg Box #2 THE BEST OF ALL POSSIBLE WORLDS; w r Tucson, AZ 85721 THE PESSIMIST FEARS THIS IS SO h e mnielsen at u_arizona.edu o