The nitrogen cycle
How bacteria turn your fish’s toxic ammonia into nitrite and nitrate, why a new aquarium needs to cycle and how to keep your filter healthy.
Everything for a healthy, colourful aquarium
Care, aquascaping and the best products for your fish, from Lake Malawi to the coral reef.
Latest articles
The most beautiful community fish: colourful eye-catchers for your aquarium
Cardinal tetra, ram cichlid, pearl gourami or Boeseman’s rainbowfish: these peaceful species are the eye-catchers of a community aquarium. How to keep them at their most beautiful.
The most beautiful reef fish for your marine aquarium
From the psychedelic mandarinfish to the royal gramma and the firefish: these reef fish are among the most beautiful, and here is what you need to know before buying them.
The most beautiful mbuna: colourful rock dwellers from Lake Malawi
Yellow, cobalt blue, orange or striped: mbuna are the most colourful inhabitants of Lake Malawi. These species are among the most beautiful, and here is what you need to know about them.
Keeping Malawi cichlids: the complete beginner’s guide
As colourful as a coral reef, but in fresh water. How to set up an aquarium in which Malawi cichlids stay healthy and the peace is kept.
The most beautiful discus varieties: from Blue Diamond to Pigeon Blood
Turquoise, Blue Diamond, Pigeon Blood or Leopard? The best-known discus colour varieties at a glance, and how to recognise a truly beautiful fish.
Livebearers: guppy, platy, molly and swordtail
Livebearing fish are colourful, hardy and give birth to live young. All about guppies, Endlers, platies, swordtails and mollies, and how to keep your aquarium from overflowing.
The most beautiful corals for your reef aquarium, from beginner to expert
Soft corals, zoanthids, mushrooms, LPS and SPS: which corals are the most beautiful, which are easy, and what should you consider when placing them?
The most beautiful peacocks and haps from Lake Malawi
Aulonocara, the Electric Blue and the Red Empress: ‘peacocks’ and ‘haps’ are calmer and larger than mbuna, and the males are among the most colourful freshwater fish.
Setting up your first reef aquarium in 8 steps
A reef aquarium looks complicated, but with patience and the right order it is very doable. This step-by-step plan takes you from empty tank to first clownfish.
Wild discus: natural beauty from the Amazon
Heckel, green, blue or brown: wild discus from the Amazon are less vivid than bred varieties, but have an unmatched presence. Here is what you need to know.
Aquarium fish breeders in Europe: where do your fish come from?
Most community fish come from Asia, but Europe has a surprisingly large breeding tradition, led by the Czech Republic. An overview of where your fish come from and why local breeding pays off.