da nastavim u predsjednikovom stilu ....
evo jedan o nitri... , nitri..., ma dobro, evo jedan o preparatima ...
Nitrifiers prefer a
pH level from 7 - up to mid 8's. However, a stable pH level with no fluctuations is more important. This also relates to most fish kept in an aquarium. Fish can take pH levels slightly out of their preferred range, but not the fluctuation. The goal in either case is a stable pH.
More recently, products containing colonies of nitrifying bacteria have become available at pet shops (e.g., ``Fritz'', ``Bio-zyme'', ``Cycle''). In theory, adding the bacteria jump-starts the colonization process as above. Net experience with such products has been mixed; some folks report success, while others report they don't work at all. In principle, such products should work well. However, nitrifying bacteria cannot live indefinitely without oxygen and food. Thus, the effectiveness of a product depends on its freshness and can be adversely effected by poor handling (e.g., overheating). Unfortunately, these products don't come with a freshness date, so there is no way to know how old they are
Products that contain starter bacterial colonies should be avoided. The effectiveness of these products is questionable and they may encourage cloudy water & algae problems later on. The bacteria that we are trying to promote by cycling occur naturally and only need fish wastes, oxygen & time to develop. Products that adjust pH levels should also be avoided as they tend to cause drastic pH changes and cloudy water troubles as well.
There are two problems with these products, one is the freshness issue mentioned in the article on
cycling, and the other is the fact that our previous assumptions about the specific bacteria responsible for the cycling process may be WRONG! Nitrosomonas and Nitrobacter bacteria have traditionally been assumed to perform the function of converting ammonia to nitrate in aquaria. However, they were identified using bacterial culturing techniques that were prone to errors. Dr. Tim Hovanec, using modern RNA analysis, found almost none of these bacteria in mature freshwater aquaria. Instead, he found large populations of Nitrospiras that could be performing these nitrifying functions. His research was published in the scientific literature in 1996 (the August issue of
Applied and Environmental Microbiology) and in the December 1996 and January 1997 issues of
Aquarium Fish Magazine. If his research conclusions are correct, then these commercial products such as
Cycle and
Sure-Start are packaging the wrong bacteria! My opinion is that you would be better off saving your money, and just use some water or gravel from an established aquarium to seed your tank.
Recently some commercial products have appeared, such as
Cycle or
Sure-Start, claiming to contain live bacteria (Nitrosomonas and Nitrobacter) that will speed up or eliminate your cycling process. It is very difficult to evaluate their claims, because most people only start up one aquarium at a time, and thus cannot provide "double blind" tests on the effectiveness of such products. There have been one instance reported in the
Aquatic Plant Digest of a person who cycled two tanks at the same time, one with
Cycle and one without, and directly compared the cycling time between the two (by monitoring ammonia, nitrite and nitrate). He found no difference.
It was originally thought to be
Nitrobacter s
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