What is this?

[Ebslinger]

Good Afternoon,

I noticed this thing on the glass of my aquarium today. Any Idea what it is?

Appears clear, with 4 or 5 white dots in the center. Also, the tentacle like appendages seem controlled and not just moving in the current...

I know the picture isn't great... I would say total overall size is about 1/4 inch.

 

[Jose Mayo]

Cnidarian, probably larval stage of Aiptasia sp.

 

[Ebslinger]

Well, it's out of the tank what ever it is... I hate Aiptasia!