Leave the lone Aptasia alone?

[robdssa]

I have a solitary aptasia that continues to grow in my tank but has not spread (well over a year).
I was considering dealing with it but worried it will spread if I attempt to eradicate it. If it isn't
spreading around the tank, might I be better off leaving it well enough alone? Anyone else had
a similar situation and never had one spread?

 

[Pistol]

I had 1 for quite a while, tried to kill it and now have hundreds.
If you can remove the rock it's on, I would try that and get rid of the rock

 

[Shooter000]

It has already spread, it is to late you wont see them but i guarantee there are more now, best bet is berghia nudibranch or peppermint shrimp, good luck..