I just started up a tank and after a little over one week, one of my plants started turning yellow. I made some adjustments to the water when it started turning and it did not bounce back. I think that I did not have adequate lighting for the plant. I was just wondering how to tell if it is dead, or is there still time to save it? I posted pics of it after I planted it, and after it turned. Plant date was October 29th and it started turning on November 2nd. Has not gotten any better.