I have had my clowns for over a year and the one is clearly the female (she's bigger, meaner, darker on her back, etc) they went from a 12gal to a 40gal with a slow transition and were fine for about 2 weeks but now she's getting really aggressive and at feeding time she gets nasty and keeps him in the corner for the rest of the day. He's starting to look a little worn and pale and he's been swimming upside-down and side ways. He even has a black spot behind his fin. I separated her for a few so he can breath. What do I do? He looks like he'll die if she keeps this up. Funny thing is there are lots of caves too....
Temp - 75-78
All parameters are where they should be.