Do they only get most of there flow from the back to front? I had some hammers and frog spawn look similar to yours when that was the case for mine. I redirected the flow so it was more random and they went back to there normal look.
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Current Tank Info: System 1 Mixed Reef: 180g DT,180g Fuge, 120g Sump http://www.reefcentral.com/forums/showthread.php?t=2611735
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