FYI So I had more than few blue clove and what i believe are hydroids pop up on a few frags and start spreading in the frag system. I didn't want to start out treating the whole system so I picked the most populated frags to treat. I mixed 1/4 gram of Fenbendazole with 1 cup of saltwater as a dip! I let them soak for 5 min. washed them off and put them back in the system. 24 hrs later there were no signs of polyps and zoas looked fine! Treated frags look awesome a week later and are happy not to be choaked!