This seems more common in saltwater it's the water being saturated with gasses either from substrate not being turned or sumps or co2 pump malfunctioning.
It's not contagious.
Not harmful
And doesn't damage eyesight
But keep an eye on it if it changes from clear to cloudy it might be pop eye or a bacterial infection and the bubbles are a side effect.
So a few water changes and keep an air stone in there to remove the other gases from you water.
My experience + friend who volunteers at the Chesapeake foundation on the eastern shore
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