Identify Dinoflagellates & Golden Algae

Use this microscope comparison guide to identify the exact species in your reef tank. Correct identification is the key to choosing the right treatment and restoring biodiversity.

⭐ Beating Dinoflagellates, the Right Way!!!

Dinoflagellates aren’t beaten with chemicals, blackout periods, or endless water changes. They’re beaten by restoring what your reef actually needs: biodiversity, stability, and balanced nutrients.

• Stop over-cleaning: Your reef needs microfauna, not sterility.
• Raise nutrients: NO₃ 10–15 ppm, PO₄ 0.08–0.12 ppm.
• Add biodiversity: Phytoplankton, copepods, microfauna blends.
• Use UV correctly: Only effective for free-swimmers (Ostreopsis, Prorocentrum).
• Reduce white light: High white intensity fuels outbreaks.
• Stabilize your system: Consistency beats dinos every time.

Once your tank has the right conditions, dinos collapse fast — and stay gone. This guide helps you identify exactly which species you’re dealing with so you can treat it properly.

Why Identification Matters

Different species behave differently — some swim, some cling to sand, some produce toxins, and some thrive in ultra-clean water. Knowing your species ensures you follow the correct recovery path and avoid wasting time on ineffective methods.

Movement Patterns (Critical for ID)

• Ostreopsis: Slow gliding, sticky, often stationary.
• Amphidinium: Fast darting, chaotic, sand-bound.
• Prorocentrum: Smooth swimming, spinning, free-floating.
• Coolia: Rolling marble motion, slow and circular.
• Motile Chrysophytes: Smooth gliding or fluttering motion; very active.

What Causes These Outbreaks?

• Low nutrients: NO₃ under 5 ppm, PO₄ under 0.05 ppm.
• New tank instability: immature microbiome.
• Over-filtration: heavy skimming, filter socks, UV misuse.
• Too much white light: long photoperiods or high intensity.
• Lack of biodiversity: low microfauna, sterile systems.

How to Treat Each Species

• Ostreopsis: Use UV sterilization, increase biodiversity (phyto + pods), and maintain stable nutrients. Highly toxic — avoid disturbing large mats.
• Amphidinium: Focus on the sandbed. UV is ineffective. Add pods, phyto, and microfauna. Raise nutrients and reduce white light.
• Prorocentrum: Responds well to UV + biodiversity boosting. Maintain moderate nutrients and avoid over-cleaning.
• Coolia: Low toxicity. Often resolves with nutrient correction and biodiversity increases. UV optional but helpful.
• Motile Chrysophytes (Golden Flagellates): Thrive in ultra-clean water. Raise nutrients, reduce white light, stop over-filtering, and add phyto/pods. Very responsive to biodiversity increases.

How to Take a Proper Microscope Sample

1. Use a pipette to collect brown snot, dust, or surface film.
2. Place one drop on a slide — do NOT dilute.
3. Add a coverslip gently to avoid crushing cells.
4. Use 100–400× magnification.
5. Movement is the #1 identification clue.

Need Help Treating Your Species?

Explore our live cultures and dino-recovery blends to support your tank’s biodiversity and resilience.