I am into my second week of EI dosing. In the past, I do an every other day water change (10%). 3x per week. I did notice some yellowish tint before. Since I am doing a big 50% water change only by the week ends, the yellow tint becomes a bit more pronounced. Should I worry about the yellow tint in the water column. I have total of 5 drift woods. They were all boiled before being placed in the tank over 2 months ago. The water do not smell. Everything is normal.