I've had great success with Turboflotor 1000 Multi. First I had it hanging on the side of the tank but the scum that collects in the cup once went over the top and spilled on the floor. I moved it into the refugium and since then I haven't had any problems. Great skimmer and pulls a lot of gunk on daily bases.
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There comes a time in this hobby when it's just cheaper to silicone around the windows. 
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