Frequently asked questions

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 Care

Raising the pH value while lowering the hardness at the same time

Hello, deionization with a reverse osmosis (R/O) or ion exchange system is recommended in this case. You can then adjust the desired total hardness with sera mineral salt, the KH...

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 Care Invertebrates

Adjust pH value for shrimps

Hello, in case the pH value refers to "fresh" tap water you should simply wait, as it usually sinks in an aquarium (except if the carbonate hardness is very high). Otherwise I...

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 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...

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