Planted Tank Enthusiast
Join Date: Apr 2013
Location: Honolulu, Hawaii, USA
You could load a filter up with carbon and/or Seachem Purigen and run it 24/7 and it should pull out much of the tannin. The tannin is coming from dried leaves, and small wood bits in the soil you used. Unless you make an effort to remove that stuff before installing it in your tank, you'll have tannin in the water. I discovered this when setting up my first 'dirt'd' tank. For my second tank I used a kitchen strainer a 5 gallon bucket, to filter out the unwanted parts of the soil. I would sit in front of the TV and just sift out the wooden bit for days on end to get enough "clean" soil for my tank.
Here's how I would do it pull the tannin from your water: Start with HOB like an AC20, get a big container of SeaChem Purigen and SeaChem "the bag" (its the only one that will work Purigen). Take out all other media in the filter (maybe leave the carbon). Place the Purigen in the filter, and let it do its magic. If you have a bigger tank or want more aggressive results, use a bigger filter and more Purigen.
Carbon will help, but will only work for a few weeks - tops. The Purigen can be recharged and reused. The more Purigen you use the better.
You'll have to keep the Purigen working until all the tannin is done leaching from the soil. Which could be a long time, as thelub said.
Father of the Princess Zelda.
Last edited by King of Hyrule; 02-04-2014 at 06:35 PM.
Reason: explained where the tannin is coming from.