Please Help Identify

[spartanuniverse]

I noticed something growing in my tank. Tank is 3 months old and has been doing well. I have a feeling it's some type of hitchhiker but would like some input as to what it is and any positive or adverse effects. Looks like small tentacles that are inflated. Translucent in color.

 

[AlSimmons]

Aiptasia. :thumbdown

http://reefkeeping.com/joomla/index.php/current-issue/article/33-reefkeeping-101-

 

[Reef_Chief]

I would get some aptasia x on that asap.

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[JUNBUG361]

Get a File fish