03-03-2013, 12:31 PM
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It is possible to get "clean" and "clear" mixed up when it comes to filtration. The more media the water passes through, technically speaking the clearer it should be. But this is not the same as clean water.
Filtration should be suited to the fish species, and also depends upon live plants. The more plants, the less filtration (by filters) is required, since the latter will compete with the plants to their detriment. And plants perform the "clean" aspect very well if allowed to do so without interference. It is possible to have an extremely healthy aquarium with no filter at all, if there are sufficient live plants and the fish load is in balance to the plants and the water volume.
As for the fish, one has to consider the current which can be detrimental as jentrala pointed out. Aside from this, one has to also consider the size of fish in relation to the water volume. As I mentioned in a previous post, with large fish or a higher ratio of fish to water volume, more filtration is advisable. Live plants are usually minimal or non-existent in such aquaria, so the filtration needs to be sufficient.
The point I was trying to make earlier is that many of us used to be told that in every aquarium more filtration is better, but this is certainly not the case. But each aquarium has to be considered on its own, since all these factors play into the equation.
The water flow through the filter itself also is important; if it is too fast, the filter cannot perform an adequate job of filtration.