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This is biofilm forming on the surface.  It increases the water tension, preventing bubble from bursting more quickly.  Like when you add soapy solution to water.

You can skim it off, but it’s more of an indication of excess nutrients in the water column.

On 6/28/2021 at 8:26 PM, DarthBaiter said:

I also used new fish food

This is the likely culprit. The new food is probably more protein dense.  

Many times fish are reluctant to feed at the same level when new food is introduced.

Uneaten food = more nutrients in the water, which often results in this “slick” you see on the surface.

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