SunGrow 50 pcs Betta Fin Rot Treatment Catappa Indian Almond Leaves, 2, Betta Water Conditioner Leaves for Fish Tank Aquarium, L

How to Detect Fin Rot? Fin rot is brought on by poor water conditions, stress and inconsistent feeding. When it begins to take hold on your betta, you may notice physical and behavioural changes. In the early stages, the edges of your fishs fins will start to discolor causing red, black, brown or white edges.