That goby looks like it may have velvet due to the number of spots but on a white fish it's so hard to tell... Sometimes MORE blues can make it easier to see spots on a light colored fish, I would play with the lighting (if you can) and take more photos.
Is it an accurate observation that there are a lot of small spots on the fins?
Also, I would make a post in the fish disease forum
It's an easy addiction to surcomb to! Thankfully, I am "the wife" and don't get much flack from my other half. Get her involved with your ill fish, no woman can stand by when an animal is sick [emoji56]