sixty_reefer
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I do not think you can completely conclude this either. Your tank MAY have reduced ammonia based on heterotrophs - as evidenced by your large bacterial bloom - as well as potentially other things on your rock. Unfortunately we don't have a way to measure 'nitrifying bacteria' vs 'heterotrophs/algae, etc'. You might be right though
Probably not, @Coxey81 test do point out that way, plus the Third test I’ve performed the other day. There is one way to find out approximately, unfortunately the test not been performed or suggested yet.