Internal filter - practical, direct, safe

With an internal filter in the aquarium you take no risk - here no water leaks through leaking filter hose connections. The internal filter is mounted directly in the aquarium, here only a power cable goes to the outside. Open sponges are gladly grazed by the shrimps in your aquarium.

With an internal filter in the aquarium you take no risk - here no water leaks through leaking filter hose connections. The internal filter is mounted directly in the aquarium, here only a power... learn more »
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Internal filter - practical, direct, safe

With an internal filter in the aquarium you take no risk - here no water leaks through leaking filter hose connections. The internal filter is mounted directly in the aquarium, here only a power cable goes to the outside. Open sponges are gladly grazed by the shrimps in your aquarium.

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An internal filter consists of a pump head, which is electrically operated, and a water inlet. Depending on the design, a sponge is placed on the outside of the water inlet of the AquaEl PAT Mini filter, for example, which is extremely popular in shrimp aquaristics, through which the internal filter pumps the aquarium water. As the water passes through the millions of fine pores in the filter sponge, bacteria living in these pores first break down protein to ammonium, then ammonium to nitrite, and finally nitrite to nitrate. Nitrate is a plant nutrient and a comparatively harmless form of nitrogen in aquarium water. The advantage of the external sponge in the PAT Mini Filter and other filter models that also work according to this design principle is that shrimp graze the sponges, which are particularly rich in microbes, and eat the biofilms that form here. A very good shrimp food, just like in nature! Also, this way the shrimp can't get near the filter wheel in any case, which would be very dangerous for them.

Other internal filters have the filter media inside a housing and then draw the aquarium water into the interior of the internal filter through inlet slots in this filter housing. If you are using a filter like this in your shrimp aquarium, you should "disarm" it. You should avoid at all costs that baby shrimps can enter the inside, because the little ones would make unpleasant acquaintance with the filter wheel here. This is done as in the case of the Dennerle corner filter with a special attachment, the Baby Protect, or with a piece of nylon tights or a piece of very fine-pored thin filter sponge. The internal filter is packed in such a way that the shrimp can no longer reach the inlet slots. If you use a piece of nylon stocking, clamp a few filter tubes between the filter inlet slots and the stocking - with this little trick the fine-pored stocking will not clog up so quickly.

Exceptions are the air-driven internal filter JBL CristalProfi i40 and the shrimp corner filter "Round". They are operated by air, there is no dangerous filter wheel! These types of filters therefore do not need to be "defused".

When the flow in the internal filter noticeably decreases, it is time for cleaning. Either replace the filter cartridges or the fine filter fleece completely (don't worry, there are enough bacteria in the aquarium, so that you don't have to completely re-start the filter with the new filter cartridge - just don't feed much for two days, then the milieu in the filter will fit again) or simply wash out the filter media. This works especially well with filter sponges and filter tubes.

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