Hello everyone, I'm new to the forum and fishkeeping in general. I got this guy about a week ago from petsmart and kept him in a bowl until I could get a tank and move him in (which i did yesterday). But under the light of the tank I noticed this white mark on his side. I am wondering if this is something to be concerned with. I know he also has some early signs of fin rot (I picked up some medicine today for it) does anyone know what this mark on the side could be?
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