How long does it take till...

[Creat]

Fry show a double tail trait? my 5 little guys or so are now two weeks old and I was just curious how long will it take to show also they are ct cross.

[Dragonlady]

I can usually spot doubletails by the time the fry are 2 weeks old. Doubletail is recessive, and both parent fish need to be carriers of the trait for the fry to show it.

[Creat]

Ah alright should I assume that these guys are going to be all ct then?