I talked to another member here and since it was cloudy white, he thought it was probably bacteria.I wonder if that was bacterial. I have had 24 to 36 hour bacterial blooms. I wonder if you had some sort of chemical reaction?
Given the value of a dollar store ornament, I'd remove it and do a series of water changes. It could be a coincidence, but if it isn't, I would have pulled it the first day.
I'm a dollar store psychic, and I see a series of water changes after the ornament is out...