Hi all. I have a beautiful pair of mandarins. Have had the female for about 3 years and introduced the male about 6 months ago. Both were doing fine, swimming among the rocks and eating pods all day long. Since this morning, the female is crouching under a rock, not moving, not looking for pods, not eating, just sitting there. I am worried there is something very wrong with her. All other fish are fine, so are the corals and all tank parameters are stable.Nothing has changed for weeks now.