Frequently asked questions

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...

Freshwater Fish

Piranhas in an aquarium

Hello, I will split the answer into a number of different topics! Setup:a very large aquarium [at least 1,000 liters (220 nUS gal.) for 5 fish, preferably more) with sand bottom...

Freshwater Care

Plants do not grow but dissolve

Hello, it is very likely that plant pathogens or the like can be excluded - but there are many possible causes:  High conductivity (above approx. 500 µS/cm) Due to the very high...

Freshwater Fish

Platies: How can I detect pregnancy, how often do the fish give birth?

Hello, the unborn fry are visible as a gravid spot (a dark spot diagonally above the anal fin). Just before birth, even the eyes of the fry can be seen through the skin of their...

Freshwater Technical equipment

Position of the sera F 700

Hello, yes, that concerns the complete filter! Make sure that no sand/gravel can get in and possibly damage the rotor, when place it on the bottom! Best regards sera GmbHDr. Bodo...

Marine water

Pressure filters in saltwater?

Hello, yes, the pressure filters are suitable for this purpose without any restrictions. Here they are (maximum width, measured at the steel sealing ring / total height; all...

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