What's Floating on Top?

[jam5146]

We've had our tank running for about three months, the water tests fine, but there are these particles floating on top. The filter does not remove them. Could somebody tell me what it is?

 

[DSC reef]

Looks like a collection of dust, food, detritus, ect. Try pointing a power head at the surface to cause more agitation. Maybe point the flow towards the overflow.

 

[Saltybubbles288]

Exactly my thoughts. Not enough surface agitation.