If your fish’s body is swollen, cutback feeding. They could be constipated. You can detect constipation by looking at the fish’s digestive area from the side. If it is swollen, they likely are constipated. You also might notice a lack of defecation. If this happens, do not feed her for two days. #*Be sure to thaw frozen food before use. [4] X Research source

Do not tap very hard or hit the tank repeatedly. You will shock your fish.

Train them for three to five minutes at a time over several days. Proceed to other tricks once they consistently follow your finger. Once your betta can follow your finger, teaching other tricks will be easier. [7] X Research source

Gather a small mirror and a red or black-capped pen. Use the same colored pen throughout training so your betta will recognize the pen. Place the mirror in front of the tank. Once your betta flares, place the pen next to the mirror. Repeat this process two to three more times. Sometimes your betta will get afraid, and may move away. Keep on trying. Once your betta instantly starts to flare, remove the mirror and leave only the pen. Give your betta food or a treat each time they flare. Continue until your betta flares each time you show the pen. [9] X Research source

By halving your bloodworms, you can avoid over-feeding your betta. Remember, they should have a maximum of three to four bloodworms in one sitting. [10] X Research source You can train your betta to recognize a feeding stick, a thin stick with a curved end for attaching food, during their normal feeding times. Bettas naturally jump when water conditions are not good. Purchase a lid for your fish tank to prevent your betta from jumping from the tank. [11] X Research source They can still jump when you remove the lid to feed them.

This is one of the most difficult tricks so do not be discouraged if it takes a while. Be sure that your pipe cleaner is brand new and does not contain toxins that could harm your fish.