I have one male Lyretail anthias and 3 females. They've all been together since purchase, 2+ years ago. Other than the male occasionally "getting frisky" with a female, there isn't really any chasing or aggression. Yesterday I noticed that the largest of the females is getting much darker in coloration, resembling the male a bit. Would a female switch sexes if there is already a male present? It's a 220g tank so there is room, but not so much that they don't see each other all day. Is the female getting sexually mature? Any one ever seen anything like this?
"Normal" female:
Original male:
Dark female:
"Normal" female:
Original male:
Dark female: