need to figure out if this thing is safe?

[sdwarrior]

I just got a little piece of halimeda and there was some kinda cucumber attached to it here is a quick pic tell me what you think

 

Safe or not Safe?

 

 

 

[FishFreak77]

That looks like a tigertail sand-sifting cucumber. They are reef safe as far as I know. You should probably remove it though because they get fairly large and require A LOT of food in the substrate. It should be fine while it is small though. They are great for stirring up the substrate and getting oxygen mixed in it.