Fauna Marin AEFW XAEFW X works specifically against Acropora flatworms (AEFW and NAEFW). The special composition of the product blocks the larval development so that the metamorphosis producing reproductive adults is not accomplished. Adults of these species also stop reproducing and quit further growth. AEFW X is effective against: Prosthiostomum acroporae (Acropora eating flatworm) New AEFW flatworm (NAEFW) Application: AEFW X is used inside the reef tank and is reef