Frequently asked questions

Freshwater Care

Nitrite levels remains at 0.3 mg/l (ppm) for a longer time

Hello, the nitrite peak may indeed occur or be present later than after 4 weeks. Using a really highly active filter medium (sera siporax Professional) and a biostarter (sera bio...

Freshwater Care

Nitrite level remains very high for months

Hello, something is wrong with the filter if the nitrite level is still that high! The biological performance of internal and external filters is the same, provided the filters are...

Freshwater Diseases

Open wound on the head of a terrapin

Hello, yes you should. The vet has the treatments and the knowledge to treat open wounds as required. sera sanipur is suitable as an immediate measure for soothing and inflammation...

Freshwater Care

Conditioning R/O water with sera mineral salt for angelfish

Hello, this is possible without any problems, sera mineral salt has been developed exactly for this kind of purpose after all! I suggest about 5°dGH and a carbonate hardness of 3 -...

Freshwater Care

Plants do not grow but dissolve

Hello, it is very likely that plant pathogens or the like can be excluded - but there are many possible causes:  High conductivity (above approx. 500 µS/cm) Due to the very high...

Freshwater Care

Raising the pH value while lowering the hardness at the same time

Hello, deionization with a reverse osmosis (R/O) or ion exchange system is recommended in this case. You can then adjust the desired total hardness with sera mineral salt, the KH...

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