What fish can be put in a tank together with goldfish?

It's important to choose tank mates carefully for goldfish, as they have specific needs. Here's a breakdown:

Good Tank Mates:

* Other Goldfish: The best tank mates for goldfish are other goldfish. Make sure you choose varieties that are compatible in size and temperament.

* Some Minnows: Certain minnows like Zebra Danios, White Cloud Mountain Minnows, and some Corydoras catfish can tolerate the cooler water temperatures goldfish prefer. Important: Choose species that are relatively small and active, as goldfish can accidentally injure slower-moving or smaller fish.

* Certain Plecostomus: Some plecostomus species, like the Bristlenose Pleco, can be good tank mates for goldfish. They help with algae control and generally don't pose a threat.

To Avoid:

* Most Tropical Fish: Tropical fish need much warmer water than goldfish, and the combination can be fatal for either species.

* Small, Slow-Moving Fish: Goldfish can easily mistake these fish for food and injure them.

* Aggressive Fish: Fish like cichlids or some barbs can be aggressive towards goldfish.

* Any Fish with Fin-Nipping Habits: Goldfish have long, flowing fins that are susceptible to fin nipping.

Things to Consider:

* Tank Size: Goldfish are messy eaters, so you'll need a larger tank than you'd think. The rule of thumb is 10 gallons per goldfish (more is always better).

* Water Parameters: Goldfish prefer slightly cooler water (around 68-72°F) than many tropical fish.

* Feeding Habits: Ensure the tank mates have different feeding habits to avoid competition for food.

Research is Key: Always research potential tank mates thoroughly to ensure they are compatible with goldfish's needs. A good rule of thumb is to choose fish that are relatively hardy, active, and have similar water requirements.