Yeah, melano females are the infertile ones. they can produce eggs but they rupture during hatching so the fry die.
I dont know if we have melano in nz :dunno: if we do, awesome :thup:
Does your pair have any red or blue on them? if they do then they probably arent melano. if they are melano however, then you would have to use a different female. Most breeders use a blue female...cant remember the reason for this though..something to do with iridescence
Melano is recessive though so you would get multicolours in F1 and have to do some inbreeding to get your melanos back.
Ill keep my fingers crossed for the 6th attempt