Dat disease or just a scrape?

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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 :)
 
Noticed what? That white spot that is part of the curved lateral line of spots.

Nice looking dat.
 
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.
 
I’ll check the water parameters when I get home. The temp is constantly 24 degrees Celsius :)
 
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.
 
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Thank you, would you recommend melafix as well? I’ll grab a test kit at work tomorrow because there was nothing left in mine yesterday when I went to test 😂 Also, would any other chemical treatments work? Or should I not use them with the dat? Thank you :)
 
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