why is my phytoplankton not dark like others

[Cal_stir]

I would split it and put a little more f2 this time, an extra ml, are you using tap water or RO?
I used filtered water ( just after the carbon block of my RODI unit), salinity 1.019, don't use RODI

[donkey77]

iam using RO water so i should be using tap water, what about all the crap in tap water

[donkey77]

do you put yours in the fridge