Some are pink or red inside, and some are white, Alice. All have little black seeds like Mary's.
I think they are closely related to your Night-blooming Cereus, Mary but not the same as that one doesn't make fruit that I'm aware of. I would think the cultural demands would be similar, though. If you do hope to get blooms and fruit, I think you need to give it the longest, warmest, sunniest summer weather you possibly can. It takes some sun, even here in Florida, to get it to bloom.
Not sure how long those seedlings will take to get to blooming size, either. Mine have all been started from good-sized cuttings.
