I've had experience with salvinia, Amazon frogbit, RRF, azolla, and duckweed. The azolla was interesting but not really suitable for an aquarium - nor for a pond full of hungry goldfish either. I still have the frogbit and salvinia; the small amount of RRF didn't make it for whatever reason. Wish I had some more.
Duckweed - despise it. Aquatic herpes.
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