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For the best filtration don't have them leaning on the back glass. Filtration depends more on the flow. Set your rocks up leaving some space in the back and put a power head pointing towards your overflow box and then get another one to move water in front of our rocks. Good luck!
I think I have everything where it can have good circulation. I put the powerheads on opposite sides. But I did take one piece of live rock out and put it in my bigger tank. I think I had too much in there for good flow.