Hello, I was wondering if anyone had any advice for me about how to help my betta fish. I purchased him from a pretty shady pet shop in town around August of last year and settled on him since he was the healthiest of the bunch. He has been through a lot with me, a tornado, a move, etc. I mean. He's a trooper. So I recently went home for a month, I left him in his tank doing a 50% clean before I left for a month with his filter and week long feeders where my find would check up on him every other day. When I got back I cleaned his tank again, however I probably did a 80% tank change and changed the filter because it seemed pretty dirty. He was behaving a little sluggish before the tank change and after the tank change it got worse. It appears he has some fin rot, in which I've given him treatment for. However, his current behavior is to stay in the corner completely still unless he begins drifting out or to hide behind the filter. He's been in this tank since about March, it has two live plants in it and two little caves for him to hide in. Currently, it's been around 82 degrees Fahrenheit, I've been trying to keep it down but I live in the south and my apartment just gets too hot apparently. He has a heater in there in case it gets too cold, it's just rarely on. I tested the levels of everything and currently the levels are: Nitrite 0 Nitrate 0 pH 7.5/8 Carbonate Hardness 80-120 General Hardness 60-120 The stick didn't have an ammonia test on it, however, I did put in an anti ammonia tablet, so I feel as though it shouldn't be too out of control. Currently I am doing 20% tank changes every 3 days and adding a stress reducer pretty often. However, he has no external signs of discomfort other than a little blackness on the bottom of his fins so I'm not sure what's wrong with him. I I can later attach pictures if need be. I'm just worried about him. When the tornado hit my apartment he was about all I got out of there, he means a lot to me and has already survived so much. Sorry this is long, hopefully someone will be able to help.