I posted this on Monday and Larry has not improved much since then. I got home from being out of town for the weekend on Monday evening. I leave every weekend and my fish are always fine. I fast them on sunday and monday since I'm not here. Two of my bettas are perfectly fine. The other, Larry, had clamped fins when I came home and seemed really stressed. Nothing has changed for Larry. He is in a 1.5 gallon tank, with silk plants and a terra cotta pot. He has a heater that keeps his tank at 80. When I came home I saw he had blown a small bubble nest which I have never seen him do. At first I thought he was fine but when I looked closer I noticed his fins were really camped and his side fins were moving faster than normal. His breathing seems normal. His color was slightly paler than usual. He is not sinking or floating to the top so its not swim bladder. When he saw me walk by or look at him he would dart around really fast which isn't like him. But when he doesn't see me he sits right under the small bubble nest or on top of his hammock. I dont have any way of testing my water at the moment but its the same water I have always used and I have not done anything different. His appetite is normal. His color is somewhat better and hes not darting as much but he is still clamped after 4 days. I have been doing a 50% water change for the last three days. I couldn't get any pictures since he was darting but I got a video and here is a link to it on youtube. It's not the best quality but it's all I could get. What could be wrong? I'm thinking of going to petco and getting a water test kit just to be safe.
This picture is of him normally.