Martin Hallmann of course has years more experience than I, so maybe he is right. However, the one fish that were on the photo in post 1782 – I would myself feel certain that that was a male. I have never seen a female with that clear pattern in the caudal fin.
But theres no point in discussing this really .. its always a bit difficult, and I dont want to claim I know better than Martin 🙂 ..
I try to give the advice as good as I can from the images you bring. I mentioned in one of my first answers here to you that I thought most fish looked female, – so maybe they are after all.
But the photo in 1782 ?
I would hope for you that its a male .. 🙂