My Rainbowfish has this on both of his sides (right side much worse) it looks like a red ulcer/lesion and skin looks like it’s showing when viewed from the side but looks like the scale is raised and puffy when views from the tail, and has some tapered fins, any ideas what this is? Possibly fish TB (mycobacterium)!!!??He’s still eating and swimming but he’s starting to rub his sides against the tank (so are my loaches) so I started a dose of aquarium salt and API melafix tank is planted 75 gal and has plecos, archers, loaches, and rainbows, temp is 76, ammonia: 0, nitrite: 0, nitrate: 0.5, and pH: 7.5, i have a eheim pro4+ and tidal 55 and power head, I’m doing water changes (75%) every 2 weeks, and lights are on for about 12 hours a day. Power head was recently added a power head but nothing else is infected like he is. Any help is appreciated thanks!