I just got a comline 9004 DC to place in my sump. I have 9 1/2” of water depth in the sump. According to Tunze 8.9” to 9.7” of water depth is the required specs. From the bottom of the skimmer to the bottom of the surface skimmer is about 8.75”. That means with about 3/8” to 1/2” of the surface skimmer below the water, I only have about 1/4” from the bottom of the skimmer to the sump. Doesn’t seem like much clearance. Anyone have any experience with how much clearance the skimmer needs to function correctly?? Can the surface skimmer be adjusted above the waterline and the skimmer still work correctly?