i added some drift wood it is the malaysian drift wood you can get at lfs and i soaked it in hot hot water for two days doing water changes (to large to boil) and i put it in my tank with active carbon but it has been in there about a month and it still leaks a light brown color i was wondering how long it takes to stop leaking this color? and also how often should i change my active carbon to remove this color? thanks for the help.