To throw another wrench into the works, I had my Tomato male turn female on me about 2 yrs ago. Wondered why all of a sudden he started get darker sides and he (she) was fighting more with the prior Mrs. I looked one night and they were on opposite ends of the tank. First time that's happened in the 11yrs I've owned clowns.
It can happen and I have seen it on only one occasion, but it was likely over many months this power struggle occurred. My GSM pair is 7+ yrs old (3rd owner) and they are happy as a lark. Like I said, they were seperated for at least 24hrs and they knew their place int eh hierarchy within seconds. You'll be fine.