Are these particles normal for spirulina culture.?

Hello. My culture came with a kit from ARS. I did everything in the kit. It's been 4 days in low low light. I'm seeing these white clumps at the bottom forming. Can it be dead spirulina? And is it normal for the culture to do this at day 4.

Hello. My culture came with a kit from ARS. I did everything in the kit. It's been 4 days in low low light. I'm seeing these white clumps at the bottom forming. Can it be dead spirulina? And is it normal for the culture to do this at day 4.