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10-15-2013, 12:43 AM #31
It does support being horizontal. My filter takes up the entire left side of the top of my tank so I can't place the heater horizontally there. The intake tube is about 3" from the gravel roughly. I could however remove 1 section of the tube, that would place it about 7" above the gravel and the heater in between the intake and the gravel. Would that be more efficient?