I have previously had some Anabias barteri var. 'marble'. Didn't give them any special care over the regular species and they were fine for quite a while. However, I recall that over a long period of time, the new leaves were not as "marbled" as before. Perhaps this might be something you want to take note off.
By the way, got my specimen from Lim Chu Kang plant farms.
Cheers,
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