Usually how long are you suppose to soak the driftwood before you put it in your tank. I was soaking a fairly large piece for about 2 days and then put in in my tank. After a couple of days i noticed that the water started turning a bit yellowish so i did a water change. Now im noticing the water to turn a bit yellow again. Is this bad for the fish? im thinking about taking the piece out and continue soaking it in a cooler. Thanks guys.