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I tried an ug spraybar on my 120. I used a pump rated at 850gph running into a closed loop. I used 3 bars running the length of the tank with a cross piece on either end. I drilled 1/8" holes about every six inches along alll of the pvc pipes. I could see the sand being turned over near every hole. I was pleased with the system, but I had angels that don't dig.
 
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