Frequently asked questions

Freshwater Technical equipment

Does the sera blue sky support algae growth, and is it suitable for planted aquariums?

Hello, Concerning "planted aquariums":this is actually possible. However, it is mainly used for aquariums with fish from open water (e.g. East Afrikan rift lakes) due to its color. ...

Freshwater Technical equipment

Filter performance goes down very quickly, water becomes cloudy

Hello, at least the biologically active main filter media should be cleansed as rarely as possible. The minimum time before the biologically active filter compartment needs to be...

Freshwater Technical equipment

Fluorescent tube does not work when switching it on

Hello, please check whether the lamp and the starter sit in their fixtures correctly − you may slightly turn the lamp to do so. It happens rather often that the lamp sits poorly due...

Freshwater Technical equipment

Forgot to switch the filter back on after feeding

Hello, these were rather certainly bacteria and other protein metabolizing micro organisms (so-called infusoria) that were not drawn into the filter (where the organic matter would...

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 Technical equipment

How can I regulate the suction with the sera gravel washer?

Hello, you can regulate the water flow and, correspondingly, the suction by simply covering the free end of the hose partially with your thumb. Best regards sera GmbHDr. Bodo...

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