white film on glass

[kengeroo]

I have always had the regular green algae on the glass that would need scraping....

I started to does redsea NoxPOX a while ago,,, and recentley I switched the SPS AB+ schedule on my radions....

recentley I noticed I don't get the green algae anymore...
I get a white film that is easily scraped off..

SPS are fine,,, LPS aren't as bubbly as they usually are...

Is this and indication that I am starving my tank of soemthing ???

Nitrates are 5,, Phosphate 0.1
alk 8.3-8.6
cal love 400s
mag mid 1300