Hi all, I haven't been on the site for awhile. We worked really hard (my husband that is) on a sump for my 72g and a weir overflow. We were very excited to have it finished and running. Problem is, no matter how hard we try we can't seem to get the water levels stable. It's always coming in a little too fast or a little slow. We have to watch it constantly. I'll try to give you the info you need, to maybe see if you can help us out. First of all, the sump is only 10 gal. I know it should be bigger, but it is all we could fit in the cabinet. We have 3 sections with the skimmer in the middle. The skimmer is a Marine Pro Series 100. We have a 1" tube with a 1" ball valve coming from the Weir to the sump. The pump is 600L/hour with a 3/4" return tube back up to the tank. The ball valve is a plumbing type valve and hard to adjust. The slightest amount of a turn makes a huge difference in the flow. It never seems to remain stable. I know all you geniuses (hows that for kissin' up? ) can help me figure this out. It's driving us crazy! What else can I tell you that would help. Thanks so much for your help in advance. Sorry about the long post.