I really wish I found a solution to the noise this thing makes in this thread. @mixer911 its great you defend your product but to be honest, your shadow over flow is what I'm least impressed with from my build. I've searched for days, weeks and months without a solution. I've tried the directions RS provides to no success. I've tried experimenting with different stand pipe heights- from lower to higher to no stand pipe at all for the full siphon. I've allowed the water in the rear box to come up as high as possible without actually spilling over and it's still loud. Someone suggested I make sure the bulkheads connecting the internal box to the external box are submerged... noise. Two things make it dead silent, removing the weir, and stuffing the internal box with filter foam. Neither one of those is a solution in my opinion. I do not come here to bash you or Reef Synergy but I beg you, provide us with a solution that goes beyond "experiment a bit". It's hard to enjoy my tank with the noise that comes from it.