D. salina is another algal species I’ve been growing. I find this one really endearing and quite fascinating. It’s an extremophile that can live in waters with very high salinity. For our experiment at home, we’ve also grown it in high salt concentration and it’s doing great.
The species turns a vivid pinkish-red-orange colour when exposed to strong light. It produces β-carotene to protect itself from solar radiation. Watching this inconspicuous alga turn pink over the course of a couple of weeks on a south-facing window sill has been a real joy.
And here are some images of how that looks out in nature (images from algix.com)