Small bubbles

[Bluespottedjawfish1]

Can anyone advise me on how to eliminate small bubble appearing on the upper rock work of my reef?
There is no visible algae other than a thin red algae ( not cyano) and purple photosynthetic spong.
My photoperiodis twelve hours with Radions gen4 pros (x4).
I feed reasonable well as I have a lot of fish but all coral (sps and lps) are doing well. Water chemistry is perfect. Wondering if maybe too much amino, am adding x15 drops of coral vitaliser at lights out.
My aquarium is a40 gal (96x30) double bow front.

 

[Reeferdood]

Can you post a picture?

 

[Bluespottedjawfish1]

Yes, I need to wait for the lights to come on
I used a turkey blaster to blow of the rock work as I have not done this for a long time and there was quite a bit of detritus that I was able to remove. This may be helping this issue.

 

[Bluespottedjawfish1]

Here are a couple of photos, as you can see I do have a persistent red algae that I cannot get rid of. It is not cyano and while my urchins chow down on it they cannot get it all.
Small bubbles are just preset after the lights have been on for around 5-6 hours and are at full intensity.
It is obviously a photosynthetic process.