Fish Bowls

Choose a bowl based on the species' minimum volume and activity level; small single goldfish need at least 10 gallons (38 L) despite common bowls being smaller, while bettas can live comfortably in 2.5–5 gallons (9–19 L) if filtered and heated. Prioritize larger volumes when possible because bigger water mass stabilizes temperature and water quality

Look for material (glass vs. acrylic), included filtration or compatibility with small filters, a cover or rim to reduce evaporation and jumping, and optical clarity and thickness; acrylic is lighter and less breakable, glass resists scratching and yellowing

Prices vary by size and material; budget options can be found under $50, while larger or specialty bowls typically cost more. Expect an average around the mid-range for common sizes, with additional cost for built-in filters or designer shapes

Perform partial water changes (20–50%) weekly or biweekly depending on stocking and filtration, clean uneaten food and debris, test ammonia/nitrite/nitrate regularly, and clean or replace filter media if a filter is used. Small volumes require more frequent monitoring because water chemistry changes faster

Many common aquarium fish are not suitable for bowls due to space and filtration needs; suitable choices are small, low-oxygen-demand species like solitary bettas, certain small shrimp, and snails when the bowl is properly cycled and maintained. Avoid keeping goldfish or schooling fish in bowls

Place the bowl on a level, sturdy surface away from direct sunlight and drafts to reduce temperature swings and algae growth, use a stable mat or stand sized for the bowl's base, and avoid high-traffic areas where the bowl could be knocked over

A heater is necessary for tropical species like bettas if room temperature falls below their preferred range (around 76–82°F / 24–28°C). A filter is strongly recommended for any bowl housing fish to maintain water quality; if no filter is used, very frequent water changes and low stocking are required