Frequently asked questions

Freshwater Technical equipment

How can I build a bypass filter for denitrification?

Hello, the construction principle is actually very easy:all you need is a chamber equipped with intake and an outlet connectors, which is filled with sera siporax Professional [0.5...

Freshwater Fish

How can I catch fish that cannot be caught with a net?

Hello, it is in many cases sufficient to use two nets:Use one net (usually the smaller one) for chasing the fish into the calmly held second net. This is rather successful after some...

Freshwater Diseases

How can I help a fish with unspecific symptoms?

Hello, without specific disease symptoms you will unfortunately not be able to do much more than put the fish into a separate tank, provide plenty of oxygen in the water (possibly...

Pond Freshwater Fish

How can I hibernate goldfish living in a pond indoors?

Hello, goldfish can hibernate in cold (4 - 6°C / 39 - 43 °F) water (in that case do not feed nor disturb them) Usually, temperatures inside the house (including the basement) are...

Freshwater Care

How can I lower the iron level?

Hello, this is indeed the correct way if the high iron level is caused by fertilizing too much. You may simply carry out a water change for lowering the level immediately. In case...

Freshwater Care

How can I lower the KH value?

Hello, this is possible with pH lowering products such as sera pH/KH-minus, but also by sera super peat (blackpeat granulate). These products are necessarily based on acids...

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