When it comes to the Finding Nemo franchise, Pixar really seemed to do it's research. Their fish science went the distance to make the movie feel as authentically under the sea as possible - mostly.
My advice? Don’t even worry about it. Of course, “Finding Dory” isn’t as good as the original “Finding Nemo” was 12 years ago. That, after all, was only one of the string of animated feature ...