bangaii cardinal becoming aggressive

[jhj0112]

So I have a bangaii cardinal who is chasing my pygmy angel constantly for several days..

they were ok for several months.. I don't know what triggered bangaii but he is only chasing after pygmy.. he leaves clownfishes and gobies alone..

pygmy angel seems to be ok(no fin damage or anything) but what should I do? will they be ok after a while?

I have RSM 130 with 30lb of LR...