The movement of water in an aquarium should be slow but steady. With regard to the filter flow rate, this means that the golden rule is “as much as necessary, but as little as possible. In aquaria containing plenty of plants and only a small number of shrimps, the plants will produce enough oxygen for the animals in the aquarium.
- Sanna K. wrote about Dennerle Nano Corner Filter XL in 2018:
I already own the smaller version of this filter, and like that very much so I purchased this XL model for a bigger filtering capability for a bigger aquarium. This filter has a very nice and soft flow, so it is suitable for bettas, fish fry, shrimps and other creatures that doesn't like a strong current, but because of the outflow pipe and adjustable flow rate it is still possible to get very good water circulation on the surface for proper oxygenation. It rarely needs cleaning ant the cleaning is quick and simple. I also purchased the Baby protect -add on to this filter even though I have had no problem with raising shrimps without it, but I'm planning to use it on my breeding tank and I want to be sure that the eggs or the newly hatched fish fry don't get to be sucked into the filter. Best feature is the possibility to adjust the outflow pipe almost any direction imaginable so you could for example place the filter horizontally in a shallow water. And the fact that this fits to the ...
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