A user recently purchased a 120L aquarium with the intention of creating a planted tank, expressing a desire to avoid keeping fish. They are interested in the aesthetic appeal of planted aquariums but acknowledge the challenges involved, such as maintaining CO2 levels, lighting, and nutrients. While some participants suggest that fish are beneficial for plant health and easier to maintain than plants, others share their experiences with both freshwater and saltwater tanks. Recommendations include ensuring adequate lighting (1-3 watts per gallon) and considering the size of the tank for plant care. There are also humorous anecdotes about past aquarium experiences, including mishaps with saltwater setups. Overall, the discussion highlights the complexities of maintaining a plant-only aquarium and the varying opinions on the necessity of fish in such environments.