Water turns white while light off??

[philipchan]

I usually turn the light on around 10pm, and switch it off at 8am, so about 10 hours per day.
Recently I found out that every night when I got home, the water will become a little bit white(not clear). But it will become clear again after light on for 2 hours or so. I can't figure out why.
My tank now↓
Salt 1.025
Cal. 480
NO2 <0.3
NO3 ~20
Pho. ~1.0
PH 8.2~8.4
KH 13~14
I'm still working on the NO3 and Pho. keep lowing down slowly.

Please help~

[seapug]

what are you using to maintain calcium and alkalinity?

[shaginwagon13]

For my tank, I found that if i had micro-bubbles in the aquarium at night....the night lights would reflect off of them and make it seem like the aquarium was a little 'white'. I got rid of the bubbles by adding filter socks and reduced the flow a little and the aquarium was clear as glass at night from that point on.

[RobbsReef85]

what is your livestock?

i know when clams mate they spew white goodness everywhere