Goldfish Care, Tank Setup & Health Guides
Practical, vet-reviewed guides on goldfish care, tank setup, feeding and health – everything you need to raise happy, healthy goldfish.
Latest Articles
Fresh guides, care tips and health advice from the Goldfish Living team.
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Male vs Female Goldfish: 5 Ways to Tell Them Apart
Sooner or later every goldfish keeper leans on the glass and asks it: are you a boy or a girl? The fish, unhelpfully, looks exactly the same either way. Sexing goldfish is a genuine skill, but it is a seasonal and comparative one. The clues are real, they are just subtle, they hide for most…
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Fantail Goldfish Care Guide: Tank, Diet & Health
Ask someone to picture a fancy goldfish and they will describe a fantail: a round little body and a big double tail fanning out behind it like a silk skirt. It is the fancy most beginners buy first, and usually the right choice. But the fantail’s charm and its main problem are the same feature.…
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Black Moor Goldfish Care: Tank Setup, Eyes & Feeding
Plenty of goldfish are pretty. Only one looks back at you through a pair of binoculars, and the black moor’s protruding telescope eyes are the reason people stop at its tank. Those eyes are also the whole care problem. They stick out, they barely work, and they injure easily, so black moor keeping is really…
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Ranchu Goldfish Care Guide: Tank, Feeding & Health
Every goldfish swims by rowing with its tail and steadying itself with the fin along its back. Every goldfish, that is, except the ranchu, which was bred to have no dorsal fin at all. That missing fin is why a ranchu waddles more than it swims, pitching and rolling its way across the tank in…
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How to Cycle a Goldfish Tank: The Complete Fishless Guide
The most common way a goldfish’s life goes wrong happens before the fish ever comes home. The tank gets bought, filled, and stocked on the same afternoon, and a week later the water is cloudy, the fish is gasping, and everyone is confused. Nothing mysterious happened. The tank was never cycled, which means the bacteria…
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Best Filter for Goldfish Tanks: Types, Sizing, and Maintenance
Ask experienced goldfish keepers what matters most and filtration comes up within the first minute. Goldfish eat constantly, produce a heavy waste load, and can foul a tank faster than almost any other common aquarium fish. That is why filter choice matters more for goldfish than for most freshwater fish. The right filter holds ammonia…
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Oranda Goldfish Care Guide: Wen, Tank Setup & Feeding
Somewhere around its first birthday, a young oranda does something that panics new keepers. A soft lump appears on top of its head, then slowly spreads across the cheeks and gill covers like a raspberry taking shape. That lump is the wen, the fleshy crown the breed is famous for, and it is completely normal.…
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Goldfish Swim Bladder Disease: Causes and Treatment
Few sights in fish keeping land harder than a goldfish that cannot swim level. Yesterday it cruised the tank; today it bobs at the surface like a cork or lies pinned to the gravel, paddling and getting nowhere. The instinct is to assume the worst, but buoyancy trouble is a symptom with several causes, and…
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Goldfish Tank Size Guide: How Many Gallons You Really Need
Almost every goldfish story starts the same way: a tiny starter kit from the pet store shelf, a two-inch fish, and water that clouds within the month. A few months later the fish is gone, and everyone agrees goldfish are fragile. They are not. They are just crowded. With the right volume of water, a…
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What to feed, how much and how often – balanced diets explained.
New to goldfish? Start here
Follow these three beginner-friendly steps and your goldfish will thrive.