What is this stuff on my glass?

[katakat]

Tank is a couple months old, nothing new added. Parameters are fine, and only new addition in the last couple weeks is adding a power head. We woke up this morning and noticed this on all sides of the tank and nothing we can think of comes up in a search. We’re still pretty knew to the weird wonders of salt water, I thought maybe part of the “ugly phase” but our other aquarium did not experience this.

stock contents:
1 blue chromis
1 Diamond goby
1 striped dottyback

1 pulsating Xenia
1 Kenya tree
1 zoas
1 hammer

No hitch hikers were found after adding any corals and no other oddities in the tank.
Thank you for any help in advance!

 

[blaxsun]

Do they move?

 

[katakat]

Do they move?

They move with the flow of the water, but do not detach or move on the glass itself

 

[PotatoPig]

Some sort of biofilm, bacteria, algae build up. I get this also. Scrape it off with the magnet cleaner and make sure to change your filter socks a few hours later or they’ll get clogged.