Fish Care Tips
Ethan Sullivan
| 09-04-2025
· Animal Team
Are you a goldfish enthusiast or thinking of getting one? Goldfish are lovely pets that can brighten up your home, but they require proper care to thrive.
In this article, we'll go over everything you need to know to keep your goldfish healthy, happy, and swimming smoothly. We'll share expert tips to ensure your fishy friend enjoys a long, healthy life!

Choosing the Right Tank

Goldfish are active swimmers, so they need a spacious tank to live happily. If your tank is too small or overcrowded, your goldfish may feel stressed and have trouble breathing. The ideal tank size depends on the type of goldfish you have.
Generally, each goldfish needs at least 57 liters of water. If you're keeping fancy goldfish, which are smaller and more delicate, you'll want a tank with at least 76 liters of water per fish. Standard goldfish, on the other hand, need about 38 liters per fish, as they're more resilient.
Tank shape matters too. Rectangular or cylindrical tanks are better than round or spherical ones because they provide more surface area for oxygen exchange. Glass or plastic tanks are also preferable because they're easier to clean and maintain than ceramic or porcelain ones.

Decorating the Tank

A clean tank is essential, but adding some decor can make it a beautiful home for your goldfish. Decorations come in three main types: substrate materials, plants, and ornaments.
Substrate materials like sand, pebbles, or pearls serve to beautify the tank and help with water filtration. When choosing, avoid sharp or tiny materials that might injure your fish.
Adding water plants like water hyacinth or moss enhances the tank's appearance and helps oxygenate the water. Trim plants regularly to prevent them from blocking the water flow or light.
Ornaments such as castles, bridges, or ships can provide hiding places for your goldfish. Just make sure to clean them often to avoid dirt and bacteria buildup.

Regulating Temperature

Goldfish are sensitive to temperature changes. To keep them healthy, they need a stable water temperature that supports their metabolism and immune system. If the water is too hot or too cold, it can lead to stress or illness.
Fancy goldfish need slightly warmer water, ideally between 20-23°C (68-74°F), while standard goldfish do best between 15-20°C (59-68°F).
In colder months, a heater may be necessary to maintain the right temperature. In summer, a fan or cooler might be needed to prevent overheating. Always use a thermometer to monitor the water temperature and avoid drastic temperature changes.

Installing a Filtration System

Goldfish produce a lot of waste, which can pollute the water with harmful substances like ammonia and nitrites. To keep the water clean, it's essential to have a good filtration system in place.
There are three types of filters: mechanical, biological, and chemical. A combination of all three is the best option for goldfish. Mechanical filters remove physical debris, biological filters support beneficial bacteria that break down organic matter, and chemical filters absorb toxins.
A canister filter is ideal for goldfish tanks, as it provides thorough filtration and allows you to adjust the water flow.

Providing Oxygen

Goldfish need oxygen to survive. Without enough oxygen in the water, your fish may struggle to breathe and spend too much time near the surface. To ensure your goldfish have plenty of oxygen, you can increase the surface area of the water or introduce water movement.
Using an air stone or spray bar is a great way to add oxygen to the tank. These devices create tiny bubbles that increase the oxygen level and help aerate the water. Always make sure the air pump is sized correctly for your tank and that it's connected properly.

Feeding Your Goldfish

Goldfish are not picky eaters, but it's important to feed them properly to keep them healthy. While they'll enjoy a variety of foods, not all of them are suitable for goldfish.
The best food for goldfish is specialized goldfish pellets, which are designed to provide the nutrients they need. Be sure to select food based on your goldfish's size and breed.
You can also occasionally offer live or frozen food like shrimp or bloodworms, which provide high-quality protein. Vegetables like broccoli and peas can be given occasionally for fiber. Just be careful not to overfeed your goldfish, as this can lead to obesity or digestive problems.

Regular Water Changes

Goldfish need clean water to stay healthy, so regular water changes are a must. If the water becomes murky or the chemical balance is off, your goldfish may become stressed or sick.
As a general rule, change 10-20% of the water in the tank every week. This helps maintain the nitrogen cycle and keeps the water fresh.
When changing the water, use a siphon to remove debris from the tank bottom and a water conditioner to treat tap water. Always check the water temperature to ensure it's the same as the water in the tank to avoid shocking the fish.

Breeding Goldfish

Goldfish can be bred in a home aquarium if the conditions are right. To trigger breeding, create a simulated spring environment by gradually increasing the water temperature and providing extra nutrition.
When breeding, ensure there are plenty of hiding places and appropriate surfaces for the fish to lay eggs on. After the eggs hatch, carefully manage the environment to support the growing fry, keeping the water quality pristine.

Preventing Disease

Goldfish are vulnerable to diseases, especially if the water quality or diet isn't ideal. To keep your fish healthy, focus on maintaining good water conditions, avoiding overfeeding, and keeping an eye out for any changes in behavior or appearance.
Common diseases include white spot disease, fungal infections, and bacterial infections. Early detection and treatment are key to preventing serious issues.

Conclusion: Happy Goldfish, Happy Home

Caring for goldfish can be a rewarding and relaxing hobby. By following these guidelines, you'll be able to create an environment where your goldfish can thrive and show off their beautiful colors. So, let's make sure we're providing them with the best care possible and enjoy watching them grow and flourish in our homes!
If you've learned something new about goldfish care, share this with other fellow Lykkers, and don't forget to keep an eye on your aquatic friends—after all, their happiness is our responsibility!