I'm back from vacation... see what happened:
The third sprout is a paradise bird plant (strelitzia reginae).
I put them into seperate pots with palm soil and onto the balcony where it is mostly shadowy, so they can get used to more light.
\edit: Forgot to mention... max temperature was 34 C, min 21 C. That's interesting since the sticky guide in this forum for sikkimensis recommends lower temperatures (down to 10 C I think).