Aquariums

Choose an aquarium based on the adult size and number of fish you plan to keep; larger tanks (20+ gallons) are more stable for water chemistry and easier to maintain, while small tanks under 10 gallons are suited for one or two small species and require more frequent monitoring

Key features include a reliable filtration system appropriate for tank volume, a cover or hood to reduce evaporation and prevent escapes, integrated lighting suitable for plants if used, and durable glass or acrylic construction with good seams and a stable stand

Starter aquarium kits and small tanks can be found in budget ranges under $50, mid-range complete setups typically fall between $50 and $300, and advanced or large systems can cost several hundred dollars; remember to budget additionally for filter media, heaters, substrate, and test kits

Perform regular partial water changes (commonly 10–25% weekly or biweekly depending on bioload), test water parameters (ammonia, nitrite, nitrate, pH) periodically, clean filter media as recommended by the manufacturer without removing all beneficial bacteria, and remove uneaten food and waste

Cycling establishes beneficial bacteria to process ammonia and nitrite; this can be done by adding an ammonia source or introducing a hardy starter organism, monitoring ammonia→nitrite→nitrate until both ammonia and nitrite are consistently zero, which typically takes several weeks

Beginners often have success with low-maintenance freshwater tanks in the 10–30 gallon range using hardy community fish; look for kits that include filtration, lighting, and clear setup instructions and avoid specialized systems requiring advanced water chemistry control

Research species adult sizes, temperament, and water parameter needs; follow general stocking guidelines such as the inch-per-gallon rule as a rough starting point but prioritize species-specific space and social requirements and leave room for filtration capacity