Dosing Phytoplankton

It is pretty difficult to overdose live phyto. In short, almost any amount added on a consistent basis will be beneficial. The organisms that consume it will grow and multiply to a point of equilibrium. This will be very beneficial to the system. The phyto feeds some organisms (including some corals) directly, and other organisms and corals consume the increased pods, offspring, and microorganisms that multiply because of the increased phytoplankton available. The phyto also consumes nutrients until it is consumed itself.

 Having said that, I usually recommend starting to dose at 3ml/10gallons of system volume per day. This will actually give you more phyto cells than some other brands because I grow and ship the phyto at denser levels than some growers. As you observe, you can increase this amount by several times if you want (my smallest system is a 40 breeder with 20 sump, and I dose about 150ml/day).  Pretty much the more the better.  Or, a smaller amount would be okay too.