While other organisms can contribute to harmful algal blooms, dinoflagellates are the most common culprits. They are single-celled organisms with two flagella, which allow them to move through water. Some species produce toxins that can harm marine life and humans.

Here are a few important details to keep in mind:

* Not all dinoflagellates cause red tides. Only a few species are responsible for these harmful blooms.

* Red tides can be caused by other organisms, but they are less common. These include diatoms, cyanobacteria, and other types of algae.

* The term "red tide" is a bit misleading. While some blooms turn the water red, others can be brown, green, or even colorless.

It's essential to remember that red tides are a complex phenomenon, and understanding the role of different organisms is crucial for managing and mitigating their impacts.