Very cute! The pot size looks all right to me for now. They still have a little room for growth.

One note about the Kegeliella atripilosa: From my experience so far (I got a seedling in June), they really, really don't seem to like much light. I had read that too much light can cause them to drop leaves, so I put mine with by my Phals thinking that light would be low enough. I still lost leaves. I pulled it two feet further from the window but lost more leaves. Next I moved it all the way across the room and the leaf drop stopped--Good thing as there aren't many left! As of this morning I have it 6 feet from my east facing window. I will see how it likes this spot before making my next move. I'd love to hear progress reports with yours. There don't seem to be too many people growing them, and I'd love any tips or observations.

Happy growing!