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Message: <blockquote data-quote="PbMan26" data-source="post: 8100224" data-attributes="member: 85227">That adjustable wall is used to set the water height in the skimmer chamber.  So yea you can lower it if the water level is too high for your skimmer.Adjusting that wall has zero effect on anything else.  The setting of your return pump is in no way related.Removing the wall between the refugium and skimmer chamber won't have any effect on return pump either.Just note, lowering that wall or removing the other will reduce the volume of water the sump holds.Your return pump and the overflow/gate valve is what needs to be in sync.  If your sump runs dry when your gate valve is wide open and the emergency overflow is taking water, then the pump is set to high.  Just need to find the balance that works.</blockquote>