@betta.fish.usa: Betta Columnaris Explained: White & Treatment” "White cottony patches on the mouth, gills, or fins? That’s Columnaris, a fast‐acting bacterial infection often caused by poor filtration or low oxygen. Cure it with antibiotics like kanamycin plus nitrofurazone, lower tank bioload, and improve water quality." #Columnaris #BettaHealth #FishDisease