I've added some two toned African driftwood in my 30 gal tank. But before i did I soaked it for two weeks. Changing water everyday, sometimes twice a day. Then after those two weeks I boiled the driftwood for two hours. Changing the water half way thru the boil. My problem is. My water in tank is so stained I can barely see thru my tank. Im doing 30% water changes every week. What else can I do?