there are very bad for your tank.I had an aiptasia before sprout out in the middle of one of my zooanthid colonies.It killed 7-8 polyps,then the rest got diseased and i ended up losing the entire colony.Mojanos if im correct are just about as bad.If you have a syringe,you can fill it full of liquid calcium and inject the critter.It should melt away and die if you get it good enough.That is the only method that has ever worked for me.Hope this somewhat helps