• We are currently upgrading MFK. thanks! -neo

Dat disease or just a scrape?

I had to move all of the fish and water out of my grow out yesterday and into a new tank (100% same water, filtration, heater, other fish, etc, only difference is the tank which is also the same size) noticed this on my datnoid this evening. Any advice welcome :)
 
Thank you for the reply :) I’ve now circled what I noticed in red. It’s more like a small bump and isn’t apart of his usual markings. Only noticed it yesterday so wasn’t sure whether it was a scrape where I moved him.
 
Add some salt for now, 1 tsp per g. Make sure tank is cycled and nitrates are below 20ppm. Could be just some fungus or viral disease. Update as it goes.