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The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
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mr.waffles1842
sorry I asked so simple a question - I couldn´t imagine that ordinary "black water" could be any problem in a auquatic description of a biotope that contained wood; but if you have a fish tank for the decorative effect in your home .,. don´t use wood.... use wood...
pls. tell me, being a newbee to this forum - what is "tannin" apart from an acid in oaktrees... frequent in aged American Bourbon Whisky?
I take it that you are not writing about a pollutant from submerged wood decorations perhaps.... in that case the remedy would be too obvious.
Educate me...