As I mentioned at germination, one seed had a short germ and looked problematic. And my fears have come true, because it has not come out of the soil yet. I'll give it some more time and replace it with another variety if necessary. It's quite cold in the basement where my tent is located, so I have to have light close to the plants to keep them warm. Which will make them grow like lettuce :-)
UPDATE: The fifth seed didn't actually grow out of the soil, so I replaced it with Seriosa from Serious Seeds, which I got for free when I bought AK-47. Both varieties have Mimosa genes, so they are actually distant relatives :-)