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Try horizontal on the back wall centered with one above the other, one pointing left, one pointing right, I think you will be happy with them but that would be my recommended placement starting point. Be sure to have them at least 8" above the sand, they spin backwards once a day for just about 20 seconds to back flush and they can sweep up sand doing that. The only failures I see are the bearing failing from sand or dry test runs, fortunately that is a very cheap part.
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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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