So two days ago I had a coral beauty suddenly die. I checked water parameters and nothing was out of order. Then yesterday I saw my fox face has black spots on him,I looked it up and seemed like it was probably black ich. I planned to go buy medicine today, but I woke up and the spots are gone and he looked totally fine. He's eating fine, all the corals are out and happy, the other fish are generally happy except I have a weird royal Gramma that is tucking under a rock in the corner randomly looking like he's dead, but if I tap the glass he swims away normal and he ate fine this morning. I rambled on a bit, but is that something black ich can do or is that something that a fox face might do when it's stressed? I don't have any pics as when it wanted to take them the spots were all gone... Any advice would be appreciated, thanks. I edited to say I added a photo of the Gramma being weird