I added a Bangai Cardinal to my 150 SW
tank a couple of days ago. The other fish pretty much ignore him, so it's probably not aggression-related, but he stays in the same spot facing upward most of the time, and rarely moves from that spot. He doesn't eat, even though there are times when food falls right in front of him. I noticed a very small red spot near the top of his body this morning, but it's so small I don't know if it could be anything. I'd take a picture but it didn't show up on the picture. Any ideas what could be wrong with him?