Frequently asked questions


What are "cold water" and "warm water"?

Hello, this question is not as simple as it may look at first! I will start with the most clearly defined section - warm water.This (concerning the fish) refers to species from the...

Freshwater Care

What are the consequences of very high silicate levels?

Hello, high silicate levels indeed support diatom growth, but that's it. Silicate is not toxic and does not have any other (i.e. besides supporting diatom growth) harmful effects in...

Freshwater Care

What can I do about elevated nitrite levels (nitrite peak)?

Hello, using sera toxivec plus very generuous partial water changes - however without filter "cleaning" - are recommended as immediate measures. The so-called nitrite peak will then...


What can I do against cloudiness?

Hello, cloudiness may be due to infusoria (micro organisms) or fine sand particles  being swirled up, this often occurs in aquariums that are not fully biologically mature yet. The...

Freshwater Diseases

What can I use to treat fungal infections when there are shrimps in the tank?

Hello, sera omnipur can be used in such cases since it is copper free. sera mycopur, however, is not tolerated by shrimps due to its - albeit low - copper contents. Best regards se...


What do I have to consider when using sand as bottom material?

Hello, sand is generally well suited for aquariums, there are just two things to consider: The sand must be round grained (see "Types" below for details), and its grain size should...

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