Please help to ID

[noir4ik]

Dear fellows, could you please help to ID this tentacles? They are coming out mostly at the evening or night. Could stretch from 5 mm to several centimeters.
Are they reef safe?

Thanks in advance )

 

[Impala67]

What coral to you have it could be sweepers off of one of your coral?

 

[Gtinnel]

It looks like a digitate hydroid to me.

 

[noir4ik]

What coral to you have it could be sweepers off of one of your coral?

No, it coms out just from the sand.

I did a small video.

 

[noir4ik]

It looks like a digitate hydroid to me.

Yes, I have compared this name with other pictures in the internet. It is definitely digitate hydroid.
Now I have to find a way to remove it )

Thanks!