Lyretail anthias question

Hello

I bought three lyretails about a week ago. I believe they are all female (orange) so far.

They have been fine. All eating very well. There is some aggression with my red flame angel, whose personality sucks. But it is usually fine.

Today, one of the anthias is hiding in a rock. He did come out to eat and ate well. He seems to swim fine and I do not see any rapid breathing. I did notice a small nip in his rear fin a day or two ago. But it may have been there when I bought it.

Tank mates:
Red flame
2 Oce clowns
3 blue/green chromis
1 cleaner shrimp

92 gallon corner with about 50lbs of LR

Nitrates:5
Nitrite: 0
Sal 1.023-1.025
Ammonia: 0
pH: 8.2

Is the fish maybe morphing to female? They are all close in size. Sick? Scared? Typical?

I added a new 750/850 powerhead two days ago to help with diatoms on the sandbed. Maybe the fish doesnt like the flow? I cant figure out the best place for the PHs. I have a 750/850 on the left side pointed to the surface for oxygenation. Another on that side pointed mid tank. And a small 350 on the other side pointed at rocks (I ordered a 750/850 to replace that).

Thanks