Yep, agree with @Toolboysa definitely the dreaded aiptasia. What ever you do don't try and pull it out. This will just release more spores in the tank and make it worse.
You should maybe start a separate thread detailing your setup and couple of pics would be nice too. As for the aiptasia you can blast them with hot water using a turkey blaster or inject small amounts of vinegar (using a fine needle) in their mouths (but can only do 1 or 2 a day as this can effect your ph). You also get Joe's Juice or AiptasiaX which also kills them. You also get peppermint shrimp and a File fish that eats them but that is usually a hit and miss. Raccoon butterfly fish also eat them but are usually a problem with corals. I bought a Silver Scat and he got rid of them in my display, I still have in my sump which I now and then put in my display as a snack for him.
We are all here to help, don't be afraid to ask. Alot of MASA members that can help with a variety of things. Also we all had to deal with aiptasia one time or another, just be patient when dealing with aiptasia.
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