Is Distilled Water Safe for Goldfish?
Distilled water has an obvious sales pitch: nothing in it can hurt your fish, because there is nothing in it at all. That…
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Goldfish Water Testing Schedule: Ammonia, Nitrite & Nitrate
Clear water can still be dangerous water. Ammonia does not cloud a tank until things are well advanced, and nitrite is completely invisible,…
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What Do Goldfish Fry Eat? Baby Goldfish Feeding Guide
A goldfish fry hatches about the size of an eyelash, wearing its first meals as a yolk sac stuck to its belly. For…
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Can Goldfish Eat Vegetables? Safe Foods & Treats
Goldfish can eat vegetables, and a diet without them is only half a diet. In the wild, plant matter makes up the bulk…
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Goldfish Water Parameters: Ideal Ammonia, Nitrite, Nitrate & pH
A goldfish never leaves its water. It breathes it, drinks it, and releases every waste product into it, so the chemistry of that…
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Goldfish Lifespan: How Long Do Goldfish Live?
A goldfish won at a fair and dropped into a bowl usually lasts months. The same species, given a proper tank or a…
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Do Goldfish Sleep? How Goldfish Rest and Relax
Walk past your tank an hour after the lights go out and the fish you find looks broken. It hangs low in the…
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How Big Can Goldfish Get? Size by Environment
That two-inch goldfish you brought home last spring carries the genetics to become a foot-long fish. Most people never see it happen, because…
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Can Goldfish Eat Duckweed? Is It Safe?
Drop a pinch of duckweed on the surface of a goldfish tank and it rarely survives the night. The fish hunt the tiny…
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How Often Should You Feed Goldfish?
The most common goldfish mistake has nothing to do with filters or medicine. It is the generous pinch of food, repeated twice a…
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How Smart Is a Goldfish? Memory & Intelligence
Hand a goldfish a hoop and a food reward, and within a week it will swim through the hoop on cue. That is…
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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…
