What is this on the sumps water surface?

[Reef_Squirrel]

What is accumulating on the water surface in the return chamber of my sump? When i pull it out a few days later it comes right back. Is it a phosphate issue? I just finished cycling the tank over about 6 weeks and haven't done the water change yet. I also haven't transferred any fish or corals yet.

Just curious if this is something i will be dealing with on a regular basis. First time i've had a sump so it's new to me.

 

[BryanM]

I dont know what that is, but I'd be inclined to through a powerhead in the sump and see if it goes away.

 

[Science/G]

Probably a nice combo of or either bacteria or fats,lipids, proteins.