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 Heres what i did on my tank....I put the sump inside the stand, filled up with water, and then i poured table top epoxy over the top of the stand(after it was in the right spot of course)  I used 2 gallons to make about a 3/4" or so perfectly smooth and level surface.  That stuff ios amazing stuff.  I def. recomend, the only problem is it is in florida and shipping is about 2-3 weeks away!....Then i put 3 sheets of that really thin white foamy stuff then my tank.  One year later still as level as ever, and still holding water....knock on wood |