Two on the back glass, one on each side, both pointing toward the middle and aimed slightly up so as to disrupt the surface. I'd put the left one somewhere in the upper quarter height-wise, and the right one about halfway down. The third one I'd go low on the left pane behind the rock so as to keep cr@p from accumulating back there. Which model goes where... I say a little trial and error is the best way to see what works for your tank, scape, and livestock.
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