I am culturing cancer cells and noticing strange growth in the media. To me it doesn't look like bacteria or yeast, and not consistent with images I've seen online of fungi in media. I removed the media to a new T25 to monitor growth - the contaminants have proliferated about 5 fold over 5 days in culture, and are not seen when I plate fresh media. Attached image is 10x phase contrast. Can anyone help me identify these??