Need help identifying my new surprise critter

[Jastar]

I noticed this showed up about a week ago. I zoomed in a close as I can maybe about the size of a child's pinky nail

 

[Fishfreak2009]

That's a small Aiptasia anemone. Inject it with lemon juice using a hypodermic needle. I prefer a 25g on a 1cc syringe, as it is easier to maneuver and easier to inject with in a smaller organism