How much clearance do you need with the return pump going? I have the tunze magnets on my wavebox and I find if you put them on and carefully move them up the tank, you can get that little bit of an extra shove to get the wavebox the right clearance above the water. Currently the water level is just below the top of the wavebox (the top grate that slides across the top of the box is just barely out of the water) and mine works fine. You may want to give that a try if you haven't already.
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Christy's Reef Blog
My 180 Build
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