So after 4 years of reefing I have finally got flukes in my system due to a new fish that I treated showed no signs and still boom flukes. Any ways now my Achilles has about 2 flukes on him and also my Dussumari tang has one. Now some days the visible ones will be attached and other days they are not. I only have a 20 gallon qt tank but my tangs are way too big to fit in that tiny box. I have no other option but to treat it in my main tank. I have a sps and zoas in my tank. I have heard about prazipro being okay. Has anyone had success with defeating flukes in their main tank. Any advise that can help me with my intake treatment will be much appreciated thank you. Almost forgot my specs is a 400 gallon system.