I dose 5-10ML a day of this stuff:
Depending on which tank, Some is just to feed copepods, others for filter feeders, Brittle stars, mussels, clams, corals etc. There is stuff in my tanks that came in as zooplankton and now growing animals. I view dosing Phyto just as important as any other nutritional element. I can visibly see the results. Plus the stuff from holdfast is bulletproof. I never had a batch go bad, I don't even refrigerate it, just stick it on the window sill (not direct light) and shake it once a day! Not feeding Phyto is akin to ignoring all of the nutritional options out there and saying "ah.. I feed Tetramin flake food, it's fine, don’t worry about it."
Store 2 — Holdfast Aquaculture
www.holdfastaq.com