Unknown coral growing

[Jshlun]

It has been about 3 weeks into cycling my new saltwater tank with live rock and noticed the other day what looks like a coral growing on one of the rock, seeing if anyone here knew what it is??

 

[Crabs McJones]

Aptasia unfortunately

 

[kichimark]

Yup....definitely aptasia. I would take it out ASAP before it starts spreading.

 

[Jshlun]

Ok thanks for the info!!

 

[hockeyhead019]

Ok thanks for the info!!

Make sure you do a quick search on what the best way to get rid of it is. If you don't do it correctly there is a chance it starts spreading to other parts of the tank