If that is nanochloropsis it doesn't look good to me. Do you have airation going into the bottles? You shouldn't have any visible clumps in a healthy culture when you start to see clumps it is crashing.I don't know how you started your culture but in large production we bleach the seawater (with VERY little bleach) and then dechlorinate. Contamination will cause a culture to crash fast. Then wait a day, add algae + f/2 (nutrients). Within 4-5 days you should have a water column that is uniform in color and dark green. Keep us updated on the progress.