Detrius

[Pazil]

Orange spotted goby keeps our sand nice and clear....makes a little mess of the water from the debris.

[naesco]

If it is a new tank and it is sort of brown dusting, you have diatoms which is normal.
If you are using RO/DI water and are doing frequent water changes, it will go away.
Wayne

[Myka]

If it's not diatoms, and is infact detritus, then you need more flow in the tank via powerheads, not more flow in the sump.