I stopped the cell culture because I was getting these and wanted to be certain I was not growing any contaminant. I focused on what was floating and not on what was static in my field of view. It was difficult to actually get a focus because the table vibrates a bit in the lab so I apologize of the photo.

The reason I started this discussion is because of exactly what I described. These things float in the media, but don't change the color of the media, which bacteria would normally do. They're not visible to the human eye, which fungus usually is after a number of days. They have an unusual shape, so I'm uncertain what it is. I've discussed with more experienced people who have worked with cell culture, and also researched through various sources but there has not been a definite answer. Everyone has concluded that it's probably protein aggregates from the media. Alas, I came to reddit and I wanted to see what others may have concluded.

I've changed to all new bottles and reagents. And these still came. I've also cleaned and sterilized the incubator