Tiny bubbles bubbling up from live rock

[recess62]

the tank has just finished a cycle that took over 6 weeks. Ammonia and nitrite 0. Nitrate 50 on Seifert. I am running a bio pellet reactor. Small amount of diatoms are visible, some brown algea, but no cyano visible. Are these bubbles oxygen or possibly nitrogen?

 

[Leslie Tabor]

Mine did that too for quite awhile, it stops as the tank matures I think.

 

[Lab_Adam]

I would bet money that the bubbles are oxygen.

 

[Randy Holmes-Farley Verified Community Expert]

I agree most likely O2. Are they there in the early AM?

 

[recess62]

Nope. So likely something photosynthetic

 

[Randy Holmes-Farley Verified Community Expert]

Yes, probably a thin coating of algae. Not any concern at the moment.