Join Date: Jun 2010
Location: Jakarta, Indonesia
Smaller females can be bred to a much larger male (don't include fins for measurement). I've successfully bred a 6cm male to a 3cm female. Slightly bigger females can be bred as long as she isn't too fat. But much larger females often can't breed properly to smaller males . . . in fact pair of the same size often have difficulty if the female is too fat. I usually keep my breeding females in small containers to stunt their growth. Thus if I ever need to back cross fry to mother, it won't be a problem.
I agree with MattsB, breed to the red male. You can cross fry to Banana later or continue working on reds. If the female carries marble genes, you will have some marbled fry.
Condition the pair separately. IMO your male needs more conditioning than your female. He will need all the energy he can get to rear eggs and fry. Your female is fat enough.