I think that kind of technology does work, but scale up has been incredibly challenging. Let alone doing it profitably. Farming microbes in a nutrient rich slur

I think that kind of technology does work, but scale up has been incredibly challenging. Let alone doing it profitably. Farming microbes in a nutrient rich slurry is continually fighting contamination from foreign species. The most interest has been in photosynthesizing varieties where delivering light throughout the vessel becomes impossible due to the required organism density.