Frequently asked questions

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 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 Food

No water changes while being away for three weeks? / Preparing food for vacation substitute

Hello, yes, this is possible if basically everything is alright (no diseases, fish well conditioned, no basic fish stock or water problems). One more tip for the "holiday...

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

Peat (sera super peat) against algae?

Hello, peat is indeed active against algae, even in two different ways:many algae grow better in alkaline water containing carbonate than in acidic water low in carbonates - and...

Freshwater Care

pH value remains below 6.5 even after a water change

Hello, Concerning "R/O water":just a remark: the pH value of R/O water is not really important - it can vary strongly as it is not buffered. Furthermore, conventional pH electrodes...

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