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This is an unanswerable question. I mean google - the number of bacteria species in a pond - I dont know. No one knows - even @AquaBiomics. Because I believe he measures certain bacteria. i.e. you cant measure every possible bacteriaHow many of those thousands do we typically see in marine aquariums?
Correct, Heterotrophic bacteria can divide in 20 minutes and would outcompete the other bacteria.