What is this white film

Hal 9000

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so my tank has been up for about 9 months and for the past 2 months or so I've noticed this white gooey film on my rocks and occasionally in a ball on the sand bed. Any idea what it could be from? I'm also seeing little to no growth.

Tank 36x12x16 30g
Aquamaxx h1 skimmer
Use mesh filter socks change every other day
MP 10 on reef crest at 80%
Return is about 400 gph

Ph 8.28 peak .1 day night swing
Temp 78 +\- .2
Alk 7
Ca 400 (having a heck of a time keeping it up
Mag 1400
Nitrate and phos 0 (Red Sea and Hanna)
Ro/di from brs tds reads 0
Salinity 1.025

I'm at a loss help would be awesome.
 
A picture will help out tremendously :)
 
Fixed for some reason it didn't attach when I posted from my phone.

What is this.jpg
 
Yeah. Hard to see in the picture but it ranges from fuzz to globs.
 
Are you dosing any carbons?
 
I'm not. I've seen that as a common symptom but I haven't ever tried it.
 

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