Royal Gamma & Yellow tail damsel

[Pinchy]

Hello all,

Another question for you. To this date my yellow tail damsel has been quite friendly, however tonight I introduced a royal gamma and it has ****ed the damsel off. He is chasing it everywhere and has bit off large pieces of fin. I have attached a mirror to the side of the glass and now the damsel is after his reflection. My question is will the two be compatible longer term? They are different species / sizes and colors.. Your input is greatly appreciated.

Thanks!