For the last 3 days after returning from a 2 week vacation, my betta has been staying at the bottom of the tank and not eating. Occasionally I see her swimming but 99% of the time she remains at the bottom of the tank and looks to be breathing more heavily than usual. When I first got home she seemed to perk up and swim to the surface but when I tried to feed her a broken up pellet, she took a bite then spit it out. That was 3 days ago and she hasn't eaten since. While on vacation I had an auto feeder that fed her the same amount of pellets twice a day on the same schedule as when I am home. The light in the tank was off the whole time because it must be turned on and off manually on the filer housing. In its place I put a lamp facing the tank that was set on a timer for my normal schedule. I have had her for 3 months and her tank was fully cycled before I left for vacation. Her tank is a planted 5 gallon Fluval Chi with a filter. I have a heater and fan connected to a digital temperature controller that keeps the tank at 79°F +/- 0.5°. She lives with one vampire shrimp and one amano shrimp. Both are doing just fine and show no signs of unusual behavior. When I got home the water parameters were the following: PH: 7.4 Ammonia: 0 Nitrites: 0 Nitrates: 40 The tank was dirty with visible uneaten food and a great deal of poop on the surface of the sand floor. I did a 25% water change and tried to clean as much of the poop and food as possible as I thought the cause of her trouble might have been an excessively dirty tank. It was not as clean as I would have liked. The next day there was still no change in her behavior and the tank and water still looked dirty. I took all the plants and decorations out of the tank and rinsed them with treated water. I vacuumed the tank multiple times to get as much of the poop and anything else off the sand by vacuuming/siphoning water into a bucket then filtered the siphoned water back into the tank and repeating until I was satisfied. My next thought was that the water may have been bad from the excessive uneaten food and uncleaned poop, so I performed a 75% water change. In hindsight that may have been a mistake, but whats done is done. I have a second sponge in the filter housing so I am hoping there is double the beneficial bacteria to keep the water in good condition. Yesterday there was no change in her behavior and this morning I still could not get her to swim to the surface for food. I've tried to get her moving using a laser pointer but that s not worked. After reading through as many posts as I can I believe it may be swim bladder. I plan on fasting her for another day or two and trying to feed her piece of cooked pea. Because she isnt eating I dont know if I should try and add meds to the water and wanted some feedback before going that route. I would hate to loose her.