Frequently asked questions

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 Diseases

Do catfish tolerate sera mycopur?

Hello, the copper level is very low and will not cause any problems for most catfish species, nevertheless catfish should generally be transferred into another  aquarium unless they...

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 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...


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...

Freshwater Diseases

What to do in case of dropsy?

Hello, dropsy (bloated belly) is in fact not the disease itself but the symptom of a severe internal infection (mainly of the kidney). A treatment can be carried out with sera...

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