can someone tell me what this is

[TRUKINGNY]

i dont know what this is growing on the side of my rock is it another sun coral growing off the side or a aiptasia?????

 

[stbarnabas]

Looks like aiptasia to me

 

[Dre]

Use a Dremel to cut off that section before it decide to move some where else.

 

[petraio]

Aiptasia!

 

[ryangrieder]

kill it