Is there any negative effects placing gold fish with tropical fish?

There can indeed be negative effects when placing goldfish with tropical fish species in a shared aquarium. Here are a few potential problems that can arise:

Temperature Differences: Goldfish are cold-water fish and thrive in temperatures between 65-75°F (18-24°C), while most tropical fish prefer warmer water, usually around 75-85°F (24-30°C). Keeping them together can stress both the goldfish and the tropical fish, leading to health issues.

Water Parameter and Chemistry Differences: Goldfish produce more waste than many tropical fish species and have different water quality preferences in terms of pH and hardness. Mixing them in the same tank can cause water quality issues and make it difficult to maintain the ideal environment for both types of fish.

Competition and Aggression: Goldfish are known for being aggressive towards other fish species, especially those with long fins or fins that resemble food. They may nip at or even eat the fins and tails of tropical fish, causing injury, stress, and increased vulnerability to diseases.

Habitat and Feeding Differences: Goldfish are often bottom dwellers and enjoy rummaging through the substrate for food, while many tropical fish are mid-level or top-level swimmers. This difference can lead to competition for food and stress if there are not enough appropriate food options and territories to accommodate both species.

Size Differences: Goldfish can grow quite large and may outgrow the tropical fish in the tank, leading to overcrowding, aggression, and difficulty in providing adequate space for both species.

It's essential to carefully research and understand the specific requirements of both goldfish and tropical fish before considering housing them together. If done improperly, it can lead to stress, health problems, and potential harm to the fish involved. If you are unsure or concerned, it's generally better to keep them in separate tanks to ensure the well-being of all the fish.