Modified Guillards f/2 formula – phytoplankton fertiliser
Modified Guillards f/2 formula – phytoplankton fertiliser


Due to its contents it is fully reef safe, this is important as the phytoplankton it will create will be added to your tank.


Can be used to culture phytoplankton safely, with far less chance of crashing than use of a regular fertiliser.


Dosage is 1ml of f/2 formula per 2.5 litres of culture water.  This is full strength f/2 formula.

Comes with a pipette for easy measuring. Comes in a resealable pouch, you can add a bottle if you prefer this for storage for an added cost.


100ml is enough to culture 250 litres of phytoplankton!

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Nannochloropsis Phytoplankton
Nannochloropsis Phytoplankton

What are Phytoplankton?
Phytoplankton are teeny-tiny (microscopic) plant-like organisms. The name phytoplankton comes from the Greek for “plant drifters” because these photosynthetic creatures typically drift about in the ocean, absorbing sunlight and turning it into delicious sugars. In turn, filter feeding invertebrates, like the sponges, clams and corals in your saltwater tank, eat the phytoplankton for their own nutrition. Phytoplankton are a particularly good source of nutrition for marine life, because they generally have a high concentration of Omega-3 unsaturated fatty acids (fish oils) that many fish and invertebrates require in their diets.

Nannochloropsis is a well-balanced phytoplankton strain with relatively high levels of fatty acids (HUFAs) and EPA, which is important for the growth of larval fishes (and I extrapolate from that fact…just about everything else). If you are interested in breeding saltwater fish or to feeding the many different animals and corals in your tank this is the best all-around strain for you to consider. It is also thought that Nannochloropsis has some antibacterial properties


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