Nice! That's a cool set up. I like all you clams. Does it make any splashing noise as water runs over the edge and down into the 3 inch moat area? Or from the moat, to the sump?Here is an old pic years a ago but you can see the 3 inch moat around the tank to catch the water. It's like an infinity pool basically. I cover the of the so you don't see the return pipe. The drain is by the light pole of the left of picture. You need to get the correct flow on return pump as not to cause too many ripples on the water surface.
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Does it evaporate water quickly, or is it the same as in a regular tank.