Your goal is to get your fish's attention, and once you get its attention, reward it with food. If your fish responds to your finger right away, award it with food. If your fish does not respond right away, shake your finger and tap the glass until it does notice.You can consider placing your finger in the fish tank for your fish to follow as well. Some types of fish tend to bite, including Bettas, so do some research on your breed fish before putting your finger in their tank.;
, Move your finger back and forth across the tank, and reward your fish every time time it follows your finger. Getting your fish to come to your finger is the first step, but getting your fish to follow your finger as it moves may be a bit more difficult. Move your finger up and down, from side to side, etc. Do not reward your fish until it follows your finger.
 The fastest and most effective way to train your fish is by using food to reward its behavior. With repetition, your fish will learn to associate following your finger with being fed. Once your fish understands that they will be fed for doing what you instruct them to do, you'll be able to teach them a variety of other tricks.If you have pellets, use them for your training instead of regular fish food. If you use pellets for training rather than normal feeding, your fish will view them as a special treat.
Put your finger on the outside of your aquarium tank near your fish.
Get your fish to follow your finger.
Use repetition and rewards to train your fish quickly.
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