Aquarium Wiki is a community-edited information resource designed to help people enjoy aquarium keeping and make informed decisions about fish, plants, and equipment. Written from the perspective of hobbyists, it offers freshwater fish profiles covering classification, scientific names, adult size, lifespan, breeding, and practical care observations. Members can share photographs and experiences, and add comments based on their own aquariums.

The site also features reviews of aquarium products, including items sold only in physical stores, with useful details such as replacement-bulb fittings and measured power consumption. Its aquarium Q&A section connects visitors with experienced aquarists to discuss topics such as setting up tanks and growing aquatic plants. An interactive directory maps aquarium shops across Japan, where users can contribute reviews and photos or suggest unlisted stores.

Aquarium Wiki further showcases community-submitted images and product and fish reviews, creating a shared reference for beginners and experienced keepers alike. The platform invites visitors to edit and contribute, helping preserve practical knowledge and make aquarium information more accessible.