One of my betta splendens got in a tussle with one of my other bettas (who had squeaked past their tank divider), and had quite a bit of damage to her fins. I dosed the tank with a capful of this product everyday, for a week, and she's already showing substantial growth on the damaged portions of her fins. I've used other products in the past (Such as API's Stress Coat), and, legit, nothing can even compare to Seachem's Stressguard. Stressguard interacts directly with your fish, and doesn't unnecessarily coat the entire aquarium. It's a fantastic product, and I highly recommend it for fish who may have small abrasions or sores.