i turned up the screw,its way out now,like almost all the way,but i got a ton of skim out in a few hours,like 50,ml,i also divided the sump with a tank divider ,the kind with all the little holes,i was the guy that had the small sump with all the micro bubbles,i got the skimmer off dominic in blackwood,he suggested the divider,now no bubbles,and plenty of skim,is this okay dom said its fine on both accounts,thanx roger