Help identify

[mrfixer3166]

I have this in my salt water aquarium. Does anybody know what it is? It's tentacles are about inch long and it's growing fast. If you can see in picture it's spotted and looks to have a bulb on tips of tenicles. Thanks for help.

mrfixer3166

 

[mr_X]

It may be a corynactis. They don't amount to much if so. The other guess is a bleached out aptasia anemone. That one will need to be controlled.