As for Algae, I also purchased the following 8 oz jar of Spirulina Powder from Amazon about a year ago, as well.

Amazon - Brine Shrimp Direct - Spirulina Powder: https://www.amazon.com/Brine-Shrimp-Direct-Spirulina-Powder/dp/B07RVCVL79/

I purchased a couple 16 oz mason jars, which I add a couple teaspoons of the spirulina powder to, before sprinkling in some yeast. I then fill the remainder of the mason jar with hot water, screw on the lid and shake the hell out of it, to mix it up.

From there, I place the jar, containing my spirulina/yeast mix into the refrigerator.

I feed my Sea Monkeys the spirulina/yeast mix, maybe once per week. The other days, I’ll add a few drops of Seachem Phytoplankton, which they love.

Seachem Reef Phytoplankton: https://www.amazon.com/Reef-Phytoplankton-250-8-5-fl/dp/B004YLJ822

However, I’m considering switching to OceanMagik brand Live Phytoplankton blend.

Amazon - OceanMagik Live Phytoplankton: https://www.amazon.com/OceanMagik-Live-Phytoplankton-Blend-Copepod/dp/B01DSJ4UY6

I have also been looking at Mercer of Montana Live Phytoplankton Culture Kit, for he purpose of growing my own.

Amazon - Mercer of Montana - Live Phytoplankton Culture Kit - Nannochloropsis Oculata (Nanno) and Tetraselmis (Tetra): https://www.amazon.com/Marine-Phytoplankton-Culture-Nanno-Tetra/dp/B07MZ9R7D2

If anyone is interested is culturing their own phytoplankton, you can check out the different options, in the Mercer of Montana Etsy Store, which I will link below.

Etsy - Mercer of Montana - Live Phytoplankton Culture Kit: https://www.etsy.com/listing/621013763/live-phytoplankton-starter-culturing