Vertical, horizontal or 45* angle?

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They use to be horizontal across the bottom of the tank but they where too hard to get to. Now they are vertical or on a slight angle. I position most of my heaters near the filter intake to help heat distribution.
 
1 horizontal above a bubble wall
1 horizontal under filter intake
2 at 45* angle - 1 above bubble wall, 1 under filter intake
 
Mine are at a 45 degree angle - makes it easier to reach the temperature adjustment if I need to. As Mumma said, position it near the filter intake or outflow for circulation. Also keep it off the substrate.
 
Vertical in one corner so I can adjust the temp if I need to. ;)
 
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