Originally Posted by elephantnose
I also use carbon. But carbon doesn't last long and my DW just won't stop leaking tannins.
I think part of it has to do with the size of your aquarium and the amount of wood you have.. and the frequency of which you change your water.. i usually do water changes twice a week and usually only change the carbon about every month and a half and have never had a problem with tannins in my 36 the water is just as clear as coming out of the tap!
However in my 10 g. i had two pieces of mopani a (fairly large amount for the size of the tank) and it released a good bit of tannins for about a 4 or 5 months it's not a problem now at .. however the mopani in the 10 gallon i did not boil and the mopani in my 36 i boiled each for about 6 hrs changing the water for fresh water about every 30 min. so i have to think that with the carbon had a large influence on the amount of tannins that are being released..
I personally don't mind the small amount of tannins that are released i feel the look of real natural wood outweigh the tannins in the water which will decrease over time with frequent water changes.. dosen't hurt to boil it either if you have the means