Red Sea reefer 350, had the Rain 2 online for over two months now.

I keep getting nothing but slime, brown algae, and this white fluffy stuff. I've scrubbed it with a toothbrush several times.

NO3 - not detectable
Po4 - .02
Calc - 470
All - 8.7
pH ranges from 8.1 - 8.3

Mixed reef, not a lot of algea growing in the display. Tank is 1.5 years old.

Trying to upload pics.

Any help is appreciated.