TetraMin flake food

What it is

TetraMin is a dry flake food for tropical aquarium fish, made by Tetra in Melle, Lower Saxony. Pet trade magazine PET worldwide calls it the world's best-selling fish food. It sits at the centre of a range that now covers water conditioners, water tests, filters and pond care.

How it works

The original recipe combined four different types of flakes with added vitamins, which is where the name comes from: the Greek word for four joined with a syllable of vitamin. Thin flakes float at first and then sink slowly, so fish living at different depths can feed. Because the food is dry and shelf-stable, a keeper can feed a mixed community tank from a single tin, without cultures of live food.

Why it stands out

Before TetraMin, keeping tropical fish meant regular trips to streams and ponds to collect water fleas and mosquito larvae. Dr Ulrich Baensch, a natural scientist and fish enthusiast, founded his business in Hanover in 1951, set up a testing laboratory in 1953 and launched TetraMin in 1955. Germany then had only about 50,000 fishkeepers, according to Wikipedia. Convenient food lowered the barrier to entry and helped turn aquaristics into a mass hobby around the world. By 1962, when the company moved to Melle, Baensch held 15 manufacturing patents and 20 trade marks.

Where you meet it

On the shelves of pet shops and garden centres in many countries, often in the familiar red tin. The product has outlived several owners: Warner-Lambert from 1974, later Pfizer, the Triton fund from 2002 and, since 2005, Spectrum Brands of the United States. Spectrum's fiscal 2025 annual report confirms that most Tetra nutrition and care products are still made in Melle.

Sources

• Tetra: Company history
• PET worldwide: Tetra celebrates 70 years
• Wikipedia: Tetra (company)
• SEC: Spectrum Brands Form 10-K FY2025