Is this a hitch hiker?

[zwandz]

I’m new so apologies if this is the wrong spot, I also put it in zoa but thought maybe hitch hiker folks may know.
Any idea what the bubble under the heads could be? It looks like an egg so far, not really doing anything.

 

[Cell]

Likely just bubble algae, but a white light photo would help to confirm. If it is, you can just pop it off out of the water and pick off any remaining fragments if needed.