nannochloropsis phytoplankton culture (questions)

[hillbillyreefer]

I have enough cultures going that I run them until I need them. Usually 3 or more weeks. They are deep green in that time. I don't have a density meter. If I'm really curious I'll look at them under the microscope. Someday I might pickup a density meter, but I much prefer to keep things simple. I've too many other things going on to worry about phyto too much.