Hi,
i suppose it is alright.. Nanas in fact don't grow well when their roots are planted into the substrate(soil). It depends on the type of Nanas too! So it is alright for them to be tied on driftwood and grow well, however do remember to add liquid fertilisers for their well-being. Sufficient light will help as well.. if you can pump in CO2.all the better!
Cheers!










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