You're right! That statement is a vast oversimplification. What I actually meant was that they absorb nitrates and other chemicals that come from animal wastes. In this way they help to purify the water in the enclosure. Fake plants don't provide any such service.
You bring up a good point though, live plants are only one part of a successful vivarium. All sorts of microfauna are needed too!
Cheers!
Alex





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