Definitely need some more parameters to help diagnose. I have a 75 also and only have one MP40 I the right side pane, towards the front. My return comes out of the right back which I have pointed to the left also. Now, your rock formations will make a difference, (I have an island on each side) but I have no dead spots, Most SPS are on the left side island, and all the lower flow corals are happy down low.
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75 Gallon Mixed Reef
16" Shadow Overflow, Eheim 1262, Vortech MP40, Reef Octopus 150, Coralife Aqualight Pro (2 150w Phoenix 14k, 4 54w T5ho (2 ATI Actinic, 2 ATI Blue Plus)), Hydor ATO, Jebao doser
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