I was about to do a water change when I saw these guys in the back of my tank. I need to be certain if this is aiptasia as this is not to be taken lightly if untaken care of it will over run my tank. If they are feather dusters I will leave them alone. The tank has been up and running about 2 years nothing new added or changed. I have 2 pieces of coral I started with and that is all I used by fragging. So impossible for that to be the cause. If it by chance is aiptasia they only way it could have possibly entered was feeding frozen fish foods which I don’t know if that is even possible to get them that way. I already know what Im going to do if it’s aiptasia. I will get berghia nudibranchs but I will have to put my puffer in a quarantine tank while they do their job as he’d eat them.