He Mikko,
due to this single picture I'd say you've got two males. Both have very big pectoral and ventral fins, both look elegant and not as fat as a female should look like and the head shape doesn't show that many differences either. Try to feed them very good and take some new pictures after a while. If you've got a female, then it should be easier to see since it will get fatter.
cheers, Daniel
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