Plants, :lol:
I've never had a problem with water quality. I have Salvinia and duckweed filtering the water, as well as moss, and larger Marginal plants who have extended their roots throughout the water. I wouldn't drink it, but the water has never tested high in Nitrates. At one time I had crushed coral in there and that had pushed the pH to 8! I got rid of it and the pH is now back to a neutral 7.
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"Kings made tombs more splendid then the houses of the living. And counted the old names of their descent dearer than the names of their sons."
-J.R.R. Tolkien
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