Is this Aptasia

[harleyrider]

just started getting these i noticed this morning about 5 in all on the glass

[TechGuy]

Got a picture of the top of them? Doesn't look like mine. Almost looks like a creepy nudibranch, if I am seeing the feelers like I think I am.

[Aquatic Specialists]

Don, kind of hard to say for certain from that angle, I found some stock pics of aptasia that may help you identify whether or not it is aptasia.

[TechGuy]

Mine has bubbled tips. Unlike the any of the aptasia pics I have seen. That peppermint shrimp is rockin though. He leaves the big ones alone, and I let the big ones reproduce and feed him. Its a win-win

[Joel]

If it has bulbous tips, it probably isn't an aptasia, more likely a manjo (pronounced " man-yo ") anemone. These are a pest type also that should be removed.

[larrynews]

they are both pest and will over run the tank

[chromiumlux]

That there my friend is a majano and it needs to go bye bye. If left alone and allowed to establish itself it will as Larry said "overrun the tank" Then you will be nuking your rock.