# Videos | Algae ID

Source: https://algaeid.com/videos/

# Videos

Motion is one of the best clues for identifying a dinoflagellate. These are my microscope videos.

They are all on my [YouTube channel](https://www.youtube.com/channel/UCHGE_H7pW8ToT1nL4Hu6hpA) (YorickSanchez). The magnification is the objective times the 10X eyepiece, plus any camera zoom.

## Ostreopsis

Look for the cells spinning around a fixed point like a tetherball. See the [Ostreopsis page](https://algaeid.com/identification/ostreopsis/).

[Video: Ostreopsis sp. at 40X](https://www.youtube.com/watch?v=eZVmI9V-ZLc)

Ostreopsis sp. at 40X [Watch on YouTube](https://www.youtube.com/watch?v=eZVmI9V-ZLc)

[Video: Ostreopsis at 100X](https://www.youtube.com/watch?v=paBa3-9RHl8)

Ostreopsis at 100X [Watch on YouTube](https://www.youtube.com/watch?v=paBa3-9RHl8)

[Video: Ostreopsis at 400X](https://www.youtube.com/watch?v=G04hKQg9Rig)

Ostreopsis at 400X [Watch on YouTube](https://www.youtube.com/watch?v=G04hKQg9Rig)

[Video: Ostreopsis sp. at 400X](https://www.youtube.com/watch?v=hfgS582AS5w)

Ostreopsis sp. at 400X [Watch on YouTube](https://www.youtube.com/watch?v=hfgS582AS5w)

## Amphidinium

Look for the cells gliding smoothly along the surface, and for the grooves at the top of the cell. See the [Amphidinium page](https://algaeid.com/identification/amphidinium/).

[Video: Amphidinium sp. at 40X](https://www.youtube.com/watch?v=uPJYgkgCMGE)

Amphidinium sp. at 40X [Watch on YouTube](https://www.youtube.com/watch?v=uPJYgkgCMGE)

[Video: Amphidinium sp. at 100X](https://www.youtube.com/watch?v=JasNtU92OVQ)

Amphidinium sp. at 100X [Watch on YouTube](https://www.youtube.com/watch?v=JasNtU92OVQ)

[Video: Amphidinium sp. at 400X](https://www.youtube.com/watch?v=yezAo2HjW3w)

Amphidinium sp. at 400X [Watch on YouTube](https://www.youtube.com/watch?v=yezAo2HjW3w)

[Video: Amphidinium sp. at 400X, in focus](https://www.youtube.com/watch?v=Y578C6sd-wY)

Amphidinium sp. at 400X, in focus [Watch on YouTube](https://www.youtube.com/watch?v=Y578C6sd-wY)

## Predation

[Video: Oxyrrhis marina feeding on Amphidinium carterae](https://www.youtube.com/watch?v=jSJErgoqsrk)

Oxyrrhis marina feeding on Amphidinium carterae [Watch on YouTube](https://www.youtube.com/watch?v=jSJErgoqsrk)

## A practical walkthrough

My videos are mostly raw microscope footage. If you want a polished, step-by-step video about finding and dealing with dinos in a reef tank, this one from Reef Rookies is worth your time. It is another aquarist's guide, not mine, so you may notice differences from my notes on the [treatment page](https://algaeid.com/treatment/).

[Video: How to Identify and Fix Dinoflagellates in a Reef Tank! (Reef Rookies, 2026)](https://www.youtube.com/watch?v=WBm8EdDL0Vc)

How to Identify and Fix Dinoflagellates in a Reef Tank! (Reef Rookies, 2026) [Watch on YouTube](https://www.youtube.com/watch?v=WBm8EdDL0Vc)

## From other aquarists

Aquarists who sent me their microscope videos have given permission to share some of them. You will find them on the [Amphidinium](https://algaeid.com/identification/amphidinium/), [Prorocentrum](https://algaeid.com/identification/prorocentrum/), and [other dinoflagellates](https://algaeid.com/identification/other-dinos/) pages.

## More

A video of *Symbiodinium* is on the [other dinoflagellates](https://algaeid.com/identification/other-dinos/) page.