I usually use KoralMD Pro and I have had a wonderful experience with it. Well I decided to get another dip and followed the directions. My lights turned out and I saw this bristleworm crawling out after I just dipped the brand new coral as I do with all my corals. After a second dip he won’t come out. I will be returning the dip I have only used twice and am disappointed in the performance and ineffectiveness. Especially since it says it removes them right on the back and I doubled the dip and the time and he’s still in the coral.