I have seen this done in large tanks, assuming your tank is the 33 gallon in your signature I wold say your always going to have this problem. In our 180 we had problems keeping a school as the aggressive one would eventually take over.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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