what is this on the surface of my tank?

[monocus]

probably from feeding silver sides or missis shrimp

[JohnnyReeftank]

That used to happen to me too. If you don't have an overflow then a protein sheen can build up. I bought a surface skimmer attachment for my HOB skimmer and that worked. But I also found that if I emptyed my skimmer cup and cleaned it before it overflowed then I didn't notice it as much

[tt101]

no its not like an oil slick, its literally these little black peices or blobs that are stufk together by an oily filmy sticky substance. it looks like webs in the water. i heard corals shed could that be it?
and even blowing it around with a power head doesnt stop it from happening. i need to buy a surface skimmer attachment
thanks

[naesco]

Take a kitchen plate and dipping it slightly allow the skimate to flow into the plate until all the slick is gone. You may have to do this a few times

[jtbadco]

sounds to me like a combination of needing more skimming and more surface flow.

I would turn up your skimmer (if possible) or get a larger one and aim your powerheads towards the surface of the water