If it's what my green tigerbarb had ... It's a fungus ... Left a whitish patch on the body. Had to QT and treat for a week with mardel / maracyn. Daily PWC
's goes a longways in helping out.
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.