Help ID my uninvited guest

[Toronto78]

Any idea what this is?

Light brown colour. Have found two in my tank thus far. One in the rock (about 10mm long), and one in the sand pictured below (about 8mm)

have tried to grab the one in the rocks with a tweezer but it retracts very quickly.

 

[bday1335]

That would be Aptasia

 

[Soren]

+1 Aiptasia

 

[DarthSimon]

Aipstasia.... Get rid of it fast.... F-Apstasia works well.. Peppermint Shrimp, and Burgadia Nudibrach's all work.

 

[Toronto78]

Bought peppermint shrimp, but the aiptasia was already too big. Did see a tip online that worked perfectly... boiling RO water targetted with a feeding tube/pipette. Took care of the few i could see

 

[amazongb]

The one in the picture looks like it's on the sand bed, I'd suck it out during a water change if you can..

 

[Toronto78]

The one in the picture looks like it's on the sand bed, I'd suck it out during a water change if you can..

Yes, did suck that one out. Had one in my rock that i simply could not catch, killed it with boiling RO water