Introducing Equi-Care Copper Sulfate hoof treatment. This gel is perfect for preventing the growth of fungi and bacteria caused by humidity. Use once or twice a week to prevent these issues.  
To use, apply with a brush on the hoof and make sure your horse is on a clean surface for best results. If one hoof is having an issue, you can use this product to prevent it from furthering by applying to all hooves. If the issue persists, make sure to connect with a vet.