I found these tubes on the back/botom of one of my montiporas. They are hard and something inside it retracted when I picked it up. Doesn't look like a fan worm to me. The area where they have settled definitely bleached however its also an area that gets very little light where its placed. I notice the monti has not been looking as healthy as it usually does so thats how I discovered this. Attached is a photo of the potential pest and the opposite side of the coral which appears fairly healthy. If anyone can tell me what they are and if I should remove them that would be greatly appreciated. My instinct is to dip this piece but I dont want to jump to conclusions