I bought an orange hammer around 3 weeks ago (along with another hammer) and it has suddenly started bleaching. I have a couple of other hammers in my tank that are thriving, including one I bought with the hammer. My parameters are good and I assume the lighting and flow are good because the hammers around it are very happy. It did great for about 1-2 weeks then suddenly rapidly declined. I dipped it well when I got it and it shouldn't have any pests on it. I was thinking I would do a water change tomorrow just in case that is the problem. Any ideas on what the problem is and what I can do?