Tropica or Seachem would be my first choice personally.
As for the plant itself it does take a while to acclimatise to whatever set-up it's introduced into. So it may just be going through a dorment stage and pick up growth soon. If you separated the younger plantlets too soon then there growth can become stunted and slow, almost none existent. I've observed this with most of my crypts anyway, it may jsut be something i'm doing i'm not sure.
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