Clown has been in my tank a little over a month. it is the first fish, only other inhabitants are a few snails. This morning he was just hovering near the top of the water in the back of the tank when I normally feed him. Eventually he came out, as I was removing some algae and working on the tank, but still not interested in food. All parameters are in range, I don't know what's happening. The video is a little blurry but you can see that his mouth is just open. What's going on?
https://youtu.be/k5qvw8aNL_U
https://youtu.be/k5qvw8aNL_U