If you find that you’re aquarium has become infested with a coral eating pest, then one of the only sure fire ways to get rid of said pest is to remove its food source. You could dose products all day long, or let a predatory fish hunt for the parasites, but neither of these are guaranteed. Well, the chemical method might be a guarantee, but you run the risk of harming far too many of the other animals in the tank. Because of this, the only safe and sure way to fix the problem is to remove the food source of the pest. If your tank is full of coral eating parasites, such as Acropora Eating Flatworms (AEFW), then remove the corals from the tank and dose them in a separate aquarium. It can take several weeks for the pests to starve, so you might have to keep the tank coral free for a while. In the meantime, you can inspect and treat the afflicted corals in a quarantine-like setup. It’s not an ideal situation, but the only true way to get rid of them completely.