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No - except on starting up a tank1. Do you add any type of bacteria to your reef tank and if so what and why?
When I have used them - no change. I do not believe in adding bacteria to a tank (especially a mature tank). There some studies out there suggesting that added bacteria do not gain a foothold (the other bacteria outcompete) - or they take over the existing bacteria - But there is not a lot of evidence that they add any 'diversity'2. What changes have you noticed in your reef tank from these