Hi all I often read about certain woods being prone to rotting in fish tanks after a while. More specifically, I think it is the wood that is not thoroughly dead and dried inside. But I am not sure if this also applies to dried, soaked, boiled, and generally well disinfected driftwoods. Does driftwood start to rot after a while too? Is it necessary to replace driftwood every once in a while? If it does rot, when should one expect it to? Also one question. I noticed that when I had no driftwood in my tank, with regular vacuuming, there was virtually no sediment on the bottom of the tank, under the gravel. Now, even though I do regularly change the water and clean the bottom, there always is dark brown sediment, which I am 99% sure comes from the driftwood. Is it normal for driftwood to cause brown sediment under the gravel? How can I completely get rid of the sediment without taking out the driftwood, the plants, and all other natural decor? (Because I think this would be the only way to thoroughly clean the bottom, and I really wouldn't want to un-root my plants, which I'd have to do in order to completely clean the entire bottom). The brown sediment is heaviest directly under the plants and other decor which I cannot move around (like the driftwood itself). How can I remove the sediment from under the plants and driftwood? Is the sediment dangerous when left un-removed? So far my water parameters have been fine, but I really don't like this "dirt" under my gravel. What can I do about all this?