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This is meant as a general care guideline for fish. There are many different species of fish and the needs of one may differ from those of another, so be sure to discuss specific questions with a knowledgeable veterinarian familiar with aquatic animals. Be sure to research the needs of the species of fish you are adopting.

Habitat: Depending on the type of fish you choose, you’ll need an aquarium large enough to support the fish’s growth, with an air pump and submersible heater. A good rule of thumb for aquarium size is one gallon of water per every inch of full-grown fish. Tropical fish require heating elements in their habitats, but there are some freshwater fish (like goldfish) that prefer cooler temperatures and may not need a heater. It’s crucial that you do your research to find out what specific equipment the pet fish you’re considering needs.

Diet: Fish don’t have stomachs, so they never know when to stop eating. When feeding your fish, only feed i...