I have a male betta I got from a pet store about 1 day ago. All of the sudden today he is very bloated. I do t know if this is him getting used to a new diet or something else. I just fed him so he might be full but I am still worried. I added a little salt water. Should I be worried? I will be doing a water change tomorrow. I attacked another picture of him yesterday for comparison. He is swimming around and active.