If the ammonia in a clean tank drops from 4ppm to 0 within 24 hours without a carbon source is t that pretty good evidence. With fritz turbo? With other products they only drop after addition of a carbon source. What does that tell you?What is in the bottle?
The link contains a discussion about a publication of an artikel to promote a commercial product, published by the manufacturer. It is an example ! it is used to show how some professionals try to convince people. It is claimed it contains nitrifiers. ( in the case of BioRemid -aqua it is claimed it are lyophilized Nitrosomonas en Nitrobacter-bacteria ) Maybe some products contain viable nitrifying bacteria, there are plenty of heterotrophic nitrifiers out there. These nitrifying bacteria can NOT install a nitrifying capacity as they are r-strategists and need an organic carbon source. A lot of these nitrifiers may be dangerous see Acinetobacter sp.
In the case live autotrophic nitrifiers are added to a new aquarium, it will take 2 weeks to a month to install a nitrifying capacity. It depends of the bio-load wich one wants to support and start with.
Adding a biofilter makes managing the nitrogen content in a closed aquarium system an easy task.
For example, doubling the nitrifying capacity of an existing full operational biofilter may take a week to a month. Not only the nitrifiers have to double activity but also all other bacteria involved in building up a balanced microbial comunity which is a biofilm. They have to install conections with each other, they have to be able to comunnicate.
All these bacteria needed can not be delivered in a bottle! Even when this would be possible it would take weeks to install the balanced microbial community needed.
If a live nitrifying biofilm is used for to inoculate a new aquarium it would still take a few weeks to install a propper nitrifying capacity able to support a mixed reef aquarium.
Nature does not perform miracles.
Bacterial-based products of which the real content is not known, these products may just as well contain bacteria that can cause diseases, dangerous for humans and animals, and the cultivation of such bacteria in a closed unnatural environment can develop mutants and clades that can be dangerous for society and the environment. The use of such products should be BANNED in a closed biosystem such as a home aquarium. It should be prohibited by law as it can be dangerous for all live.
What is in the bottle?
Aplication at your own risk!?
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