Small "Anemone/Coral" Identification Help

[Bento]

Hello,

I spotted something growing in my tank a roughly a week ago and didn't really think much of it. And today I noticed it has slightly increased in size (it's now ~0.5cm). It looks like it could be an anemone maybe. It's clear/pale brown with some fluro yellow/green balls on the tips of the tentacles and possibly on the "body". The tentacles retract when snails etc get close.

I've attached some photos from my phone there not the best but may help.

Thanks for your time and any help :)

 

[reef lover]

Maybe a type of cup coral or ivory tube coral...hard to tell.