Both ... I guess.
If they reach 3cm (BO) by 4 months, I breed them (regular bettas).
But for giants, it's safer to wait until they reach 6cm (BO) because then you will be positively sure that you will have true giant fry.
I bred a 4cm female (The blue), now the fry look so tiny.
Most People in my area will advise 5+ months, believing that at that age bettas are more genetically stable and will produce better eggs and fry. This is at least 60% true. But young bettas will spawn and can produce strong fry. But not as many as older bettas (less than 100).
I hate when that happens. I mean at least give some sort of warning that they're going to go.... lol.
Even adults often do that - they suddenly die without showing me why. I humor myself and just think that it's some sort of fish pneumonia because they're constantly wet during bad weather ... lol
I didn't start recoding my giant until they hit 9 week old.
But that seem right.
My giant didn't explode in size until they hit the fifth week.
That's is kind of dispersing.
I have the same problem with my big earxdt.
One week I have over 100 and the next I drop down to 7.
Don't see any dead bodies
Long no talk.
Any new breeding...
Yeah I just pick up two male hm giant which I'm going to cross them to my babies hmpk giant spawn.
The babies are growing at a good rate.
Almost three month and the biggest one is about 2.5in