01-29-2010, 06:39 PM
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Originally Posted by stephanieleah
Interesting. It doesn't actually say anything in the wikipedia page that makes me think tannins would be detrimental to plants, except that in some cases excessive tannins may inhibit absorption of certain minerals like iron as it is an iron chelating material. I have a feeling, though, that if there was a significant impact of tannins in the water on plants, there would be information on this in plant/aquarium literature and someone would have come across it by now. I will say that the plants in my "tannin-ized" aquarium look a lot happier than the plants in my other clear-water one, but there are several other factors at play so it's hard to deduce anything concrete.
And tannin water is more acidic, and most of our aquarium plants come from soft acidic water and prefer it, so I would expect better growth just because of that fact.