Marbled convicts are a rare trait so breeding two marbles should increase the odds of having marbled babies.
After several generations of fry, most of your spawn should consist of marbled fry.
I have two calico females in my 34 gal. They have tons of personality great fish. They are known in.the house as the twosome. They quarrel like an old married couple. Convicts are such great value. I have never seen marble before, both of them are lovely specimens.
True. I personally like the calico convict.