I would move about half if I were you. Just to be safe. You can do the siphon trick. I move fry all the time with a siphon. They should be fine just make sure the water in the tank you move them to matches their current tank.
If you have to give a few away when they grow out, make sure they are for sure labeled as hybrids. Same as something like a flowerhorn, which most people know are hybrids. I wonder if they will be sterile? Hmm... do cichlids work like that? Haha.so your purposely breeding a hybrid to a dovii........If your gonna do this, please don't distribute these fry. This is exactly why its getting harder and harder to get pure species.
Stuff some of the media in the 20's filter too, should be an instant cycle!img going to syphon out the water in the 220 and use it to fill the 20