Sailfin Tang Vs. Yellow Tail Butterfly Fish?

[Saltwater reef]

Guys(and girls) these two will not leave each other alone! I just put in the Sailfin less than two hours ago and he constantly flaring at my butterfly? I see no damage done yet but it's night time and that's when most causalities take place. Any idea? I really don't want to lose either one!

 

[bettaowner]

Remove the older of the two and rearrange the decor.