06-10-2009, 10:45 AM
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Tannins are released by all natural wood in an aquarium, and some types have more tannins and some release it faster. Tannins won't hurt fish or plants, but they will slightly acidify the water depending upon how much and the type of wood; but this is insignificant as I have not read of anyone seeing a descrease of more than .2 in the pH. And the water will have a slightly yellowish-brownish tinge but still be "clear", sort of like tea. In time, and with the normal regular weekly partial water changes, the tint will lessen until it basically disappears. Some suggest that boiling the wood for 20-30 minutes will cause a lot of hte staining tannins to leech out quickly, if it is small enough to fit in a pot completely emersed; be aware this will stain the pot.