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Originally Posted by Subsea
Spot on. Macro is a sponge and it will absorb what is in the water. “Eliminate the excess” is interesting and explains why some macro is so messy with giving off DOC.
When I first starting growing macro, it was to produce a fresh live food from the sea. Red Ogo, Gracilaria Parvispora, has been a mainstay of Hawaiian diet for centuries. After setting up 10K gallons of tumble culture in my greenhouse, I found out that the high sulfur content of Trinity aquifier water ruined the marketability of Red Ogo as a human food.
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Interesting example. Too bad about the sulfur.
Another reason that algae exude DOC is that they cannot turn off photosynthesis when production of carbohydrate exceeds the demand. So, these organisms dump it to the water. This might be viewed as intermittent carbon dosing or potentialy intermittent poisoning of coral (some sugars are toxic to certain coral).