oh, you said "17x return rate" so i thought there was a return in there somewhere which would have suggested an overflow of some sort. You must mean 17 x water flow rate then. A picture would be nice because it is kinda of hard to imagine what everything in your picture represents. Those squares in the middle, is that your live rock pile? Does this mean your live rock sits in the middle of the tank as opposed to leaning on the glass at the back of the tank? Arrows point in the direction that the powerheads are pointing? Do they point up or down at all?
Typically one thing you want to watch out for when placing powerheads are dead spots where debris like uneaten fish food and fish poop can collect.
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