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Fish gasping, hiding, or not eating may be reacting to water problems, social stress, or illness; check their environment promptly. A symptom is a clue, not a diagnosis, and testing the water first can prevent the wrong treatment and help a veterinarian find the real cause faster. Fish & Aquariums › Health In This Guide What should you check first when a fish seems sick? Why is your fish suddenly gasping? Why is your fish hiding or not eating? Do white spots always mean ich? Should you add a general cure before testing the water? When does a quarantine tank help? What should you tell a fish veterinarian? When should you stop watching and seek urgent help? How can you collect useful evidence without stressing the fish? How do you avoid turning the hospital tank into another problem? The bottom line Sources & further reading Photograph: Damitr / Wikimedia Commons, CC BY-SA 4.0 . Resized and headline added; this adapted image is shared under the same license. Illustrative ...

Aquarium filter performance depends on who lives in the tank, the biological media, water flow, maintenance, and the real waste load. A simple filter can be the right choice, while a premium one can fail in the wrong setup, so understand the job before paying for features you will never use. Fish & Aquariums › Equipment In This Guide What does an aquarium filter actually do? Why is biological filtration the part that matters most? Are canister filters always better than sponge filters? How should you clean or replace filter media? Do you need UV sterilizers, smart sensors, or automatic feeders? What should you plan for if the power goes out? How should you compare equipment honestly? How do you choose a filter you can maintain properly? What belongs on a filter-cleaning checklist? How do you make an outage plan before you need one? The bottom line Sources & further reading Photograph: Kevin A. McGill (kevinmcgill) / Wikimedia Commons, CC BY-SA 2.0 . Resized and headline...

Fishless aquarium cycling builds up the helpful bacteria in a new tank before any fish are exposed to ammonia and nitrite. The safest setup is not the fastest one, and knowing what your tests are telling you matters more than any bottle that promises an instant start. Fish & Aquariums › Aquarium Setup In This Guide What does cycling an aquarium really mean? How long does cycling take? How does fishless cycling work? Which equipment matters from day one? How many fish should you add first? What can undo a successful cycle? How should you read a cycling log without fooling yourself? What if the cycle seems stuck? What changes on the day the first fish arrive? The bottom line Sources & further reading Photograph: Kevin A. McGill (kevinmcgill) / Wikimedia Commons, CC BY-SA 2.0 . Resized and headline added; this adapted image is shared under the same license. Illustrative photograph; not a diagnosis, water test, or endorsement of the pictured setup. The tank is set up, the...

Clear aquarium water can still contain harmful ammonia or nitrite, so appearance alone cannot tell you whether your fish are safe. A simple test can reveal problems you will never see, and the key is reading the results in context instead of chasing perfect-looking numbers. Fish & Aquariums › Water Quality In This Guide Can clear aquarium water contain dangerous waste? Which water tests should a beginner understand? Why does pH change how toxic ammonia is? Should you fix every pH reading right away? Why does tap water need treatment? What should you do if fish gasp or tests show a problem? Are test kits worth buying? How do you avoid common mistakes with water tests? What should you check before changing the water? What information belongs in a useful aquarium record? The bottom line Sources & further reading Photograph: Damitr / Wikimedia Commons, CC BY-SA 4.0 . Resized and headline added; this adapted image is shared under the same license. Illustrative photograph; no...

Betta fish tankmates depend on the individual betta, the tank setup, water needs, and the safety of every animal involved. A peaceful-looking fish in the store may behave very differently at home, so compatibility takes more than matching two names on a shopping list. Fish & Aquariums › Species & Compatibility In This Guide Why are bettas called fighting fish? Can two male bettas live together? Can a betta live in a community aquarium? Which fish should you avoid mixing with a betta? Does a bigger tank solve aggression? Are snails or shrimp safe with a betta? What should you check before buying tankmates? What would a realistic compatibility plan include? How should you judge an introduction after the first day? How do you keep a single betta's home interesting? What do reliable care sources actually establish? The bottom line Sources & further reading Photograph: Gourami Watcher / Wikimedia Commons, CC BY-SA 3.0 . Resized and headline added; this adapted image...