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I did see some bubble come off the skimmerLooks like microbubbles from skimmer forming or fractionated foam from overflow
Lack if flow on the top .Looks like surface scum due to lack of flow trapping some bubbles. usually the display tank would have overflow dump it in your sump so you won't see it. very common on non-overflow tanks.
It’s normal. I had the same thing in my sump at first. It eventually went away, but I helped it along by swirling the water around with my hand. It won’t hurt anything.Is it something bad . Can it cause to crash the tank .