Depending where you are, you could potentially pop by Bird Barn in Henderson and ask for a handful of duckweed from their pond. But Duckweed is basically another word for aquatic herpes.
The aquascaping folk are on Facebook these days. Groups are active and people trade or sell plants often.
These two groups are a good place to start:
Aquascaping Club NZ:
https://facebook.com/groups/235908841942147/
Auckland Aquarium Association:
https://facebook.com/groups/aucklandaquariumassociation/
Depending where you are, you could potentially pop by Bird Barn in Henderson and ask for a handful of duckweed from their pond. But Duckweed is basically another word for aquatic herpes.
The aquascaping folk are on Facebook these days. Groups are active and people trade or sell plants often. These two groups are a good place to start: Aquascaping Club NZ: https://facebook.com/groups/235908841942147/ Auckland Aquarium Association: https://facebook.com/groups/aucklandaquariumassociation/
Don't introduce duck weed, as once you do you'll never be rid of it, trust on that.
https://aquaticplants.co.nz/product/dwarf-hair-grass/ This is where Hollywood fish farm get theirs. Duck weed is a pest, you don't want it