I have indeed read the big post about tang aggression and plan to change my rockwork and use the mirror, but in short, I had a established yellow tang in my 125 6ft long tank and added a pbt a bit smaller than it. I also have a little baby hippo about the size of a quarter in there, but I don’t think the yellow knows he exists. The yellow has been fighting the pbt for the last week (and losing) so I put the mirror in first. The yellow did not care for his own reflection but the pbt hates itself, so he’s going at the mirror. I plan to change the rockwork tomorrow, but is there anything else I can do? I don’t know if adding more tangs is a great idea, but I probably will have enough hiding space after adding in more rocks for hiding. Just wanted some advice. I removed the mirror and they aren’t really going at it anymore but would it be wise whatsoever to just keep it there for a week longer? Thanks all.