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Does this article shed any light (pun intended) on the discussion? I know we're not talking about 'macro algae here' - but the effect of carbon on pest algae: "Growth on organic carbon substrates promotes higher biomass, lipid, and carbohydrate productivity, which further triggers the yield of various biomolecules. Since, the current mass culture practices primarily employ open pond and tubular photobioreactors for phototrophic growth, they become cost intensive and economically non-viable."
Impact of organic carbon acquisition on growth and functional biomolecule production in diatoms - Microbial Cell FactoriesDiatoms are unicellular photosynthetic protists which constitute one of the most successful microalgae contributing enormously to global primary productivity and nutrient cycles in marine and freshwater habitats. Though they possess the ability to biosynthesize high value compounds like...microbialcellfactories.biomedcentral.com
IMO, It supports my claim that organic carbon is not the primary source of carbon for photosyntehsis in green algae and other photosynthetic organisms including most diatoms (the paper below described diatoms as "unique" in this context, although cyanobacteria certainly use organic carbon the same way), and that even diatoms do not use it as a C source for photosynthesis.
"Diatom algae are products of a unique secondary endosymbiotic event between heterotrophic eukaryote and a red alga. This event resulted in amalgamation of genes and resultant metabolic pathways which are unique to diatoms like complete urea cycle, carbon concentrating mechanisms (CCM), four layered chloroplasts, C4 photosynthesis etc."
"In diatoms, majority species prefer photo-autotrophy as the preferred carbon acquisition mode which converts CO2 in the presence of light to reduces carbon."
Can photosynthetic organisms use organics for various purposes if you load up the water with them like the paper is suggesting for industrial reactors? Sure, some can.