Definitely an unusual scenario.
One, you've got a domino that didn't get evicted for bad behaviour, and judging by gold on marron, she aint young or small, so that is a pretty big domino IMO.
I would expect a GSM that big to be female by now, yet the domino way outsizes her, and thats weird too, cause the male/mate is always alot smaller than the female.
Hopefully someone really experienced in breeding chimes in, but this is a new one for me.
And I thought my maroon sharing her nem w/ 6 chromis was weird.