I do not have a sick fish at the moment but am curious as I am Legally Blind and have difficulty seeing most times seeing changes in something unless they are night and day changes.
Example: (non fish related) if with someone and the answer a question with a nod of the head. I cannot tell they have answered unless they make the nod larger or verbally answer.
With Rubyn, my betta i am having trouble seeing full detail on him unless close and even then i miss stuff.
My point in this rambling is this.
Is there a way someone can desribe or at least attemt to describe the following in a way that a visually impaired person could figure out?
To try to get a sense of my vision look at your fish make him/her all one color, Rubyns red, and take away the fine detail and the ability to see less detail the more distance away. Movement only adds to the ability to not get good focus on him.
Behavior changes are my specialty. I can read people and animals behavior/body language well