I found 2 peices of cedar wood branches in my grandmothers basement and I put them in my fish tank and it made the water yellow. Take them out or well the filter turn the water back to it's normal color?
Did you rinse them or soak them or do anything to prepare them for a fish tank? If not, then I would definitely take them out as soon as possible to prevent any possible harm to the fish.
I doub't it's anything more than normal tanins leaching out of the wood...especially with a sappy wood like cedar. Your filters won't have any real effect on the color. Remove the wood...switch to another type of seasoned driftwood and do several large water changes to return the tank to normal.
I would not use cedar, as it has oils and acids in it that are not so healthy for your aquarium. Also, it will rot very quickly since it is not a dense wood.
I thoroughly rinsed both pecies off in the bath tub. As we speak the yellow water in my bedroom 55 gallon tank has cleared up but my crawdad is missing and the bass didn't eat him maybe the cat got him. My 30 gallon tank still has a yellow tint to it.
Cedar and pine are two things I've been told to particularly avoid.
Oak is supposed to be good and tends not to be too rare, depending where you live of course
Very old oak tress often have dead wood somewhere on them so you can go out after a storm and find a few bits that have blown off. I've only used in terraria in the past but it is something I've heard used by other people in aquaria.
I posted this link onto another thread only a few minutes ago, it shows a product I have used which is a pre soaked 'marsh' root which leaches no tannins into the water; well, not the bit I had anyway.