Baby invert?

[Billiam228]

I noticed a bloom of copepods in my tank this morning on the glass but I also noticed something I can I'd and I've looked every... anyone have an idea?
It's about the size of a grain of salt, and the picture doesnt show it but it almost looks like it had tube arms? Like an urchin.
And auto focus is amazing btw

 

[cristata.reef]

Jellyfish hydroid. They'll go away over time