Aquariumforum.de is an online community and information portal for aquarium enthusiasts, bringing together beginners and experienced aquarists to share knowledge, ask questions, and showcase their aquariums. Its forums cover freshwater and marine fish, invertebrates, aquatic plants, aquarium setup and care, filtration, lighting, heating, CO2 systems, water quality, fish health, breeding, and outdoor aquatics. Dedicated discussions also explore particular species, user aquarium projects, do-it-yourself solutions, and the everyday experiences of the hobby.

Alongside its community forums, Aquariumforum.de offers a magazine with articles and industry news, a glossary, a newsletter, photo competitions, and a gallery where members can share and discuss images. Practical online calculators help users estimate aquarium volume, gravel requirements, running costs, CO2 needs, heater capacity, and water values. The site also provides introductory guidance for newcomers, including tips for planning and starting an aquarium. With searchable discussions, member profiles, and regularly updated community content, Aquariumforum.de serves as a resource for learning, exchanging advice, and connecting with fellow aquarium keepers.