Hi I got a Delta tail Betta fish 2 days ago, and today I sadly woke up to him being dead. The day I got him he was doing fine, and the 2nd day in the morning he was also doing fine but then he started to be less active and was at the bottom of the tank. At first I assumed he was just sleeping or napping, he would some times be on his side or in those weird positions they like getting into when they're sleeping. But then later that day I noticed he still was at the bottom of the tank, I made sure he was still alive, which he was and I dropped two food pellets into the tank but he didn't eat them. Then I checked on him again later and the food was still there, then I noticed he was bloated at the bottom, I looked some stuff up and looked at some discussions and concluded that he was constipated. I don't think he had dropsy because his scales didn't spike up. But sadly this morning he was dead and I'm confused on what happened, can anyone help me?