I am wondering what you call huge. ? I don't regret trying, resulting in no deaths or tragedy all aggressors removed from tank immediately & moved to new homes. I personally think my tank is in the slightly larger side with minimal rock maximum hiding holes & plenty of swim room. I spoke to guy who has 2 shouls &. 2 Achilles & he says that the fact they are becoming territorial is actually a compliment that we have done a good job replicating a reef they wish to own & if that was not the case then we would actually have less aggression. So interesting. !it never usualy works unless its a huge tank and i mean huge