Hi Kris,
I dose with vividreef live phytoplankton, 10mL (2 capfuls) twice a week (for a 75G. display). To get the most out of your dosing turn off your skimmer (filter) for several hours and let the phyto circulate. In my case I just close the valve on my returnline (diverts water flow back to the sump) and let the display circulate. The instructions on my bottle says to dose till the water turns greenish but I experimented once and that would take WAY too much. For me it was just trial and error.
________
Honda XL200