Precipitant or Detritus/Dust?

[crispyreef]

Hi all, currently struggling with a lot of very fine particles in my water column and sump. They do not seem to form on my heaters or other pumps. Could this be calcium precipitate or is it likely just detritus/dust particles from my sand? Thanks in advance

I used Caribsea Live Sand (1-2mm size). I have 2 gobies, a few snails, and 3 damsels that all mess with the sand bed.

Parameters (Salifert):
Alk - 8.5
Calcium - 450
Magnesium - 1350
pH - 8.15-8.35
Nitrate - 10
Phosphate - 0.03

Picture of the overflow box and the sump of my tank:

 

[blaxsun]

I'm going with detritus since it's in your sump.

 

[Randy Holmes-Farley]

Are you dosing anything?

 

[crispyreef]

Dosing a very small amount of All for Reef to keep alkalinity stable, 5ml on 250 liters.

 

[Randy Holmes-Farley]

In that case, I think precipitated calcium carbonate is unlikely.

 

[Garf]

I’m going with sand particles