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Zamioculcas "Raven" black - a whole new Plant so not yet
Repotting: Should you not this plant so fast, because it forms only new leaves when the roots push at borders. It is quite possible that the Zamioculcas strongly deforms their pot. That does not hurt her.
Do not throw them into fresh green plant soils until they really feel: "The pot can not get any more full now".