I think you would need at least 2 of them to get a wave going on your tank. The dims you give make your tank 335+ g but your sig says 180g. Either way I had 2 of them on my 6' 125g and could get a wave going. Don't see it happening with only one. I currently have 2 MP40W's and 2 6105's on my 280g and am considering more flow. If you have 4x K2's on your tank now I think a vortech would definitely benefit your corals. 500 bucks is a lot of money, I'm glad I picked up mine when they were only $400.
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