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This will vary with sand grain size, in my tank I found 5" in the horizontal position was the minimum with standard 2-3mm aragonite sand. The biggest issue is once per day the pump back flushes itself for about 20 seconds and if closer to the sand this will stir up the sand and it gets sucked into the pump when it rights the direction.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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