Why is my betta fish acting weird after a tank water change?

Question

I just cleaned and changed the water in my beta fish tank. I have 1 male beta fish. Afternoon putting him back in the tank with new water, he seems to be acting differently. His swimming seems to be frantic, he is at the top of the water a lot, he was searching the rocks along the bottom, and he has bumped into the tank walls a few times. Did I do something wrong with his tank? Could his water be too hot or did I not condition the water right?!? Is this normal or is there something wrong?? Pet's info: Fish | Unknown - Fish | Male

Dr. Dayna, DVM, CVA · Accepted Answer

When performing water changes it is recommended to change about 15-25 %of the water. His helps keep some of the good bacteria in the water as well as decreases dramatic temperature changes which can cause significant stress on the body. I suspect that it is the temp change that is hard in him, however if a dechlorinator was not used in the water then that could be problematic as well. If you feel that is the case please Add a dechlorinator. I hope he improves!

Why is my betta fish acting weird after a tank water change?

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