I added some bogwood and mopani wood to my tank I did soak them first, but my bog wood is huge, so anyways i put them into the tank and now the water has turned brown (tannings), i have carbon in the filter as i heard it helped, but the water is still brown, i did a 50% water change as well, it diluted the colour a bit but its still brown, will it go in time or is there anything else i can do to help it?