Bubbles in my refugium.

Is this good or bad, should i do anything.
Thanks

The fuge has been running for about 2 weeks now, parameters look good, i have been running the lights for about 8 hours a day, reverse lighting.

 

I know the pic is kind of hard to see, but if you look at the mangrove, and the pvc pipe ontop of the chateo, you will see some bubbles, they started small, and are getting larger, they dont have that green tint like bubble algae.
Thanks.

 

are they maybe just air bubbles? are the mangroves above the water at all?

 

They look like air bubbles, but how did they get there? some bubbles come down the feed tube, but they float right away, i have never seen any bubbles come close to that area, and i sit in front of it for hours some times.

Two of the 4 mangroves are out of the water, the other two are about 2 mm belove water level, i am going to fix that problem really soon, i am thinking a big gulp type cup, with sand to raise it, i dont want to do the float trick cause it might clog the drain hole.

Thanks