Frequently asked questions

Freshwater Care

Quick or slow water flow in the filter?

Hello, in fact, a cross of the two would be optimal. In case of high nitrate pollution, this can be achieved by a combination of a conventional "biofilter" (typically with flow...

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...


Replacing an aquarium with a bigger one

Hello, luckily, it is not that bad: Empty the old tank as far as possible, collect and keep the old water (!). Depending on the filter, operate it on a bucket of water as to...


Rot zones in the bottom gravel

Hello, first of all, 15 trumpet snails would be very few - possibly there are many more of them in the aquarium without being noticed! Regardlessly, the rot zone should be checked...


Sand and gravel in combination? / How much sand is required?

Hello, Concerning "sand and gravel":a small sand zone is not of much use, and the sand would literally sink into the gravel within shortest time. Also, the Coolie loaches require a...

Freshwater Diseases

sera baktopur: Application tips

Hello, Concerning "shortness of breath":No, shortness of breath is rather caused by quite a number of bacteria that also affect the gills (bacterial gill rot), and consequently...

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