Got myself a Sophronitis coccinea

[rbarata]

Update on this one...4 new growths...one is growing nicely, the 2nd one is growing too but is smaller and slow while the third one seems to be stalled.
There's a 4th one, that judging by its high growing rate seems to be the most vigorous of them all but unfortunately got trapped and I can't see any way to release it without damage.
This plant grew good roots this summer (when I got it) and some of them are long inside the pot (some coming out through the drain holes.

But there's something bothering me a bit...one of the pbulbs it's completely black in one of its sides.
Any ideas about what it could be?

Growing conditions:
- So far, it's outdoors
- 20ºC/65 F (day) and 11ºC/51.8 F (night)
- RH: 60% / 90% (day/night)
- Light: dappled bright light until noon, after that bright shade (it gets some direct sun for one or two hrs around noon)
- Water: distilled water with bi-weekly low concentration fertilizations (50 ppm N). Watered almost every day.

Photo mix: