Why is my healthy fantail goldfish sleeping under the fish tank

Answer (1 of 6): It's not likely sleeping, it's probably got ammonia poisoning and is sick. In such a small tank, it would only take a few days for the ammonia levels to reach the critical stage even with a seeded aquarium. FISH don't crawl under things and sleep, they get sick and do strange thi

Why is my goldfish lying on its side at the bottom of the tank when it's not swimming? My goldfish recently developed a habit of lying at the bottom of the tank

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Can I keep 3 fancy goldfish in my 30 gallon tank? It is filtered for a 70 gallon tank, 300 gallons per hour, and weekly water changes. Also has a baby pleco. - Quora

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Dis you know that goldfish sleep? #fish #goldfish #aquarium, goldfish

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My comet goldfish Lucy has a few spots on her right pectoral fin and keeps scratching the side of the tank. What is wrong and how bad is it? - Quora

Why are my fish sitting at the bottom of the tank? They are alive, but why? - Quora

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Goldfish constantly demanding food

Why do my goldfishes spend a lot of time at the bottom of the tank? - Quora