New fish being aggressive

[rompininphx]

I added a Starkii Damsel about 4 days ago. Also in the tank I have a black oscellaris and a bangaii cardinal. Before the addition of the damsel, both fish would be around the middle of the tank. Now, both are at the top in one of the corners. The damsel isn't constantly chasing them but will occasionally chase and swim at an angle towards them. It's a 30g tank, so that might add to his aggressiveness. I got the starkii damsel because its supposed to be a less aggressive damsel, and it looks great. Will this fish adjust to the the tank mates or should I take him out? I'd like to add one more fish as well and it looks like he would make that a problem.

 

[Reefman29]

I had a similar problem with a fiji devil damsel. Have you tried rearranging the rocks? That helped me a lot.

 

[Fibinotchi]

That is a damsel for you. If you have to have a damsel make it a last addition and a small one, even at that, you will probably have problems.

 

[LukFox]

In case rearranging the rocks doesn't work, try separating them with eggcrate or something with smaller holes as a divider for a while. Make sure they can see through the barrier though. Strange that it would get so territorial that quickly.