Greg, I too triggered on the "albino" semp in the 4th picture. There was a reported case of an albino semp decades ago that did not survive long enough to reproduce, so a true albino would be a great rarity. Even if a yellow one, it is so light in color that it is a great find. Please take care of it and give extra attention. It would be a valuable addition to the hobby.
One of the reasons that S. Gazelle appears on my "favorites" list is that during the spring, its younger plants go to a white or pale yellow color for about a month. It is a truly remarkable display.
