![]() What’s your tank size? What species of goldfish are we talking about? We’ve already covered the minimum tank requirements for Fancy and Common goldfish.īut to make things even clearer, let’s organize the number of goldfish by species and by tank size: Constant exposure to high-level concentrations will stop your goldfish from growing and reaching its full-size potential. ![]() The more goldfish you keep in your tank, the higher the concentration of this hormone in the water.Īnd the higher the hormone concentrations, the stronger the growth-inhibiting effect. This hormone has a growth-inhibiting action. Goldfish secrete a special hormone called gamma-aminobutyric acid (GABA). There’s also a scientific explanation for why this happens. If you want your goldfish to grow as large as possible, you’ll want to pay attention to space requirements. The small fish won’t get enough food to thrive in such conditions.Īnd finally, cramming too many goldfish in the same space can stunt their growth. Smaller or slower goldfish get the short end of the stick in this situation. Goldfish are very friendly, but they’re not the type to share the goodies. Feeding time also becomes a source of problems. Keeping multiple goldfish in a crammed aquarium can increase stress levels not only due to water pollution. The second reason is competition for food. Excess waste can quickly lead to increases in ammonia, nitrites, and drops in pH, all of which can be stressful and even deadly for fish. Not something you want for the long-term health of your fish. Keeping multiple goldfish in a smaller tank can lead to rapid fluctuations in water parameters. They’re big eaters and have stocky bodies. ![]() ![]() Why, then, would you need so much tank space for them? Well, there are three main reasons for this.įirst, you’ll have to consider water parameters. They’re not territorial and they actually enjoy the company of other fish. A tank with floor space at least 3 feet long should suffice. They’re also slower, more mellow fish, so they don’t need that much room. Each additional fancy goldfish will require an extra 10 gallons.įancy goldfish grow up to 8 inches long at most. For each additional fish, you’ll need 15-20 extra gallons worth of tank space.įancy goldfish do fine with at least 20-gallons worth of tank space. The tank should be wider, rather than taller. With regards to floor size, they need a tank that’s at least 4 feet long. These fish are rapid swimmers and can grow up to 12-18 inches. Common goldfish need a minimum of 30 gallons. If you’re looking for an exact number, here are some species-specific approximates. They can get along with tankmates even in more densely populated tanks. They need wide floor space and enough room to turn around.Īnd they might need more space than you assume, but they aren’t territorial. They need plenty of swimming space to stay entertained. Not all grow to the same adult size, so they don’t have the same space needs. That’s because there are so many varieties of goldfish to choose from! There’s a lot of confusion surrounding goldfish and tank dimensions. Keep reading to find out more about this topic! Ideal Tank Size for Goldfish We’ll go over what the ideal tank size is, why it matters, and how to know how many goldfish you can fit in a tank. In this article, I’ll tell you everything you need to know to choose the perfect tank size for your goldfish. If you don’t want to constantly upgrade to a larger aquarium as your goldfish grow, you’ll want to choose the right size for your goldfish from the get-go. Tank size is the most important thing to consider when buying or preparing a goldfish aquarium.
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