Demasoni and yellows can cross breed, it is unlikely due to them being completely different genus but it has happened before, same with yellows and red zebras..
I stripped a mouth full of demasoni the other day and got a heap of radoms out of her mouth, they are kept with brown haps, empresses, peacocks the babies I stripped like like red empress babies. I fed them out anyway as you just don't know what they are but I suspect the female demasoni picked up and raised another fishes babies.