Interesting you posted this, Andos; I just looked up sexing gold barbs the other day. I'm about 95% sure I have 2 males and 2 fems, but I don't have the hardware to really attempt to breed them.
ATM, I'm limited to just my 30 long tank (w/out even a 10g quarantine...) and nothing to separate the fry into... so if/when they do breed, I doubt I'll actually even know it happened.
Although, one of the fems is certainly looking 'plump' as of late...
More pics will soon follow, btw; I replaced that angel with a gold gourami (I suspect it's an 'opaline' gold gourami and want confirmation) and as soon as she lets me get a respectable pic of her, I'll post it.