Particles

To make the water even more believable, I've decided to do plankton particles. To create a plankton effect I’ve created a nurbs plane and set it as an emitter. But the particles were going straight up and quite fast. To decrease their speed I've created a gravity field and set the magnitude value to -0.1. And to add some randomness in the movement I've added turbulence field and set the magnitude value to 50 and frequency value to 0.5.

Here is a play blast of the particles: