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Yeah that’s what I was thinking. The first ones ventral fins each the analfin. Is that a trait of a male?The second one is almost certainly a female. First pic I'm not so sure, the fins are very tattered, but it looks more like a male to me.
That’s how I chose these I tried to get two that bodies looked different from each otherVentral fin filaments are usually longer in males, as are first few dorsal spines. The lack of spangles within the black spot is another indicator. However I find the easiest indictor when you have a few to choose from is the body shape. Males are noticeably longer in shape. Females are stockier and rounder. Your female is also showing signs of a rosy belly.