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LRS078,
I have just set one up that closly matches your discription. It is a 18gallon rubbermaid, with 130lbs of standard yellow playsand and a 1/4" layer of CC on top to limit sandstorms and to provide some buffering, on my 210 reef /100 gal sump. I used a 3/4" bulkhead in and a 1" out with a ball valve to control the flow from a rio 1700 pump. I currently am just using the lid as my upper support but the idea of zip ties sonds like a better idea.
Mines been up for just over two weeks now and this weekend I'll be checking levels to get an idea if it's starting to help. I think from my reading that it will be a month before real results start to show. Once I do start to see the results I will also be adding one to our 180 FO that tends to have a bit higher tollerance but it will still be good to get it under control.
-Glen
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