Spirulina Is much happier warm. Harvesting is kind of boring. Got a 5 gallon bucket topper with a fine mesh strainer for engine oil. Scoop out a bunch, flush repeatedly with fresh water, you get a green gelatinous cake that doesn’t taste like much (tofuish?)
https://youtu.be/64cEmjtwRgw
Personally, I'm not opposed to this kind of food but integrating it into your existing diet can be challenging.