Last Tuesday I got a Betta fish from petco. Gamma was acting amazingly, very responsive, active, making me bubble nests already...quite a happy guy. This past Friday evening I went home for a day and a half and returned this Sunday afternoon around 4. I fed him immediately and noticed he was not acting like his normal self which made me think he was just upset with me for leaving. All day he has been very unresponsive, sluggish, and laying at the bottom of his tank nudged underneath a decorative rock or his moss ball. At one point he spit out some of his food. His fins which are usually very expressive are clenched. He is not interested in me at all or any stimuli. I'm so concerned he won't make it through the night. I did a 20% water change and I'm planning on doing a full tank change tomorrow morning.Tank: 2.5gal filtered, Decor: rock, moss ball, gravel, hammock leaf Does anyone have any suggestions on something I should do. I've become quite attached to Gamma and I'm hoping he pulls through.