Modified F/2 Nutrient Medium – Grow Dense, Healthy Phytoplankton Cultures
Your phytoplankton culture is pale, slow-growing, or crashing after a few days. The problem? Most people use seawater alone which lacks the concentrated nutrients phytoplankton need for rapid cell division and high-density growth.
Reefphyto's Modified F/2 Nutrient Medium solves this. Based on the proven Guillard F/2 formula used in research labs worldwide, this precisely balanced fertiliser provides everything your algae needs to multiply fast and stay healthy so you can harvest dense, nutritious phytoplankton for your reef instead of watching cultures fade.
Why Your Cultures Need F/2
Fuels Rapid Cell Division
Concentrated nitrates and phosphates provide the building blocks for protein synthesis and energy transfer. Your algae cells divide faster, reaching harvestable density in 7-10 days instead of weeks.
Prevents Nutrient Crash
Trace elements (iron, manganese, zinc, copper) and essential vitamins (B12, thiamine) keep cells healthy through multiple harvest cycles. No more mysterious culture crashes.
Works with Multiple Species
Optimised for both green algae (Nannochloropsis, Tetraselmis) and flagellates.
Produces Better Nutrition
Well-fed phytoplankton = nutrient-dense phytoplankton. F/2-grown cultures have higher lipid content and better nutritional profiles for your corals, filter feeders, and copepods.
Perfect For
Home phytoplankton culturists • Our Phytoplankton Culture Kit users • Anyone culturing Nannochloropsis, Tetraselmis, Isochrysis, or mixed species.
How to Use
Dosage: Add 3ml per 2 litres of saltwater culture
Schedule: Dose at culture startup, then as needed based on growth
Combine with: Consistent light (18-24hrs), gentle aeration, stable temperature (20-25°C)
First Harvest: Typically ready in 7-10 days under optimal conditions
Pro Tip: Use with our Phytoplankton Starter Cultures for fastest, most reliable results. The cultures are already adapted to F/2 nutrients.
What's Inside
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Nitrates – Nitrogen for protein synthesis and cell growth
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Phosphates – Energy transfer and metabolism
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Iron, Manganese, Zinc, Copper – Enzyme function and chlorophyll production
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Vitamins B12 & Thiamine – Enhanced cell health and division
No silicates included, this formula is optimised for non-diatom species.
