Please help! I have a 2.5 gallon tank with no filter and a heater that keeps the temp around 76. I change his water 100% once a week. The tank has three live plants and black sand. I rinse the plants in cool water every change and rinse out the sand, then refill the tank with tap water, treat it with water conditioner and then let it sit until the temp is the same as the water my fish is being held in. When the temp is the same, I put my fish back in his tank( few hours). The problem is that EVERY TIME I gonthrough this process, and put him back in his tank, he acts like he is dying for two days, then like clockwork is acting normal again on the third day after being in his fresh water. He continues acting healthy until the next water change a few days later. I don't know what is wrong! I love this fish and want to do everything right for him, please help me with your experiences and suggestions! I didn't think I had to cycle a 2.5 gallon tank if I changed the water at least once a week. Is that true? Also, I have not let the water age before putting it in the tank, it comes straight from the tap into the tank, BUT then it sits in the tank for usually half the day before I put my betta in. Is it wrong the way I am doing it? Please be kind, I am doing my best, this is my first fish and I am learning. By the way, when I say he is acting like he is dying, what I mean is that he lays at the bottom of the tank on his side or hangs out at the top of the tank vertically with his fins clamped. Then after two days, swims around with a bunch of energy again and unclamps his gorgeous fins.