why is my phytoplankton not dark like others

[monocus]

most likely it has to brew for a longer period of time.what strain of phyto are you using?i use r/o water at 1.025 salinity run through an uv sterilizer.for a gallon of phyto i use about 3 ml of micro algae grow.lighting i made my own led strips using 1 watt leds(25 per strip)various cultures like different lights(nanochloropus-white/red,tetraselmus-red,isocrysis-blue-etc)i'm using aquamedic reactors for my cultures and rotifers