Tang Troubles

[mseepman]

So Yesterday I placed a Red Sea Sailfin and an Orange Stripe Bristletooth Tang into my Display. They had been in the same tank together for a long time and had no animosity to each other. My big yellow in the display was a completely different matter. Although I've had the lights out over 24 hours, he has beat the live poop out of the Sailfin. It's upper fin is in tatters.

I have placed two mirrors around the tank and tacked two big pictures of yellow tangs to the outside glass all to no avail. Prior to the addition I only had two tangs in the tank...yellow and a hippo. The Hippo has been hiding the whole time the lights have been out.

My issue is that I can't keep all my SPS in the dark forever...am I missing something. This tank is almost 300g and over 7' long. It's not like there isn't space for them all. The Sailfin immediately made a home at the opposite end from the yellow. No one is bothering the Bristletooth that I've seen.

Any suggestions.