Are these eggs?

My wife and I have occasionally seen tiny pieces of this stuff but it has always been floating around and never this concentrated. We clean and test the tank regularly and this huge pile of (stuff) showed up basically overnight. Thought it might be eggs but can't find reference images that look similar.

My wife and I have occasionally seen tiny pieces of this stuff but it has always been floating around and never this concentrated. We clean and test the tank regularly and this huge pile of (stuff) showed up basically overnight. Thought it might be eggs but can't find reference images that look similar.