I bought a better fish today. I have 9 other betas so i am aquatinted with them and their care. I added him to a 6 gallon tank all on his own. I have never had a problem with any of betas and adding them to their tanks. But this betas was from a store i have never bought from before. What is concerning is that ever since i put him in the tank he is up at the surface. at first he was breathing heavily but then stopped shortly. Now he is just unresponsive. I went in a few mins ago to check up on him and he was at the bottom not moving. fearing he was dead i moved him with a net and he swam to the surface and then went unresponsive again. to the point i can hold him in my hand for a few seconds before he response and swims away. I am very concered. Now here is what i did different to what i have done with all my other betas. before putting him in my tank i acclimated him and put him in a seperate small container for 15 mins with "Kordon Fish Prep Natural Preventative Fish Bath" since i have never bought from this LFS i wanted to be safe and had just gotten this stuff on sale. He was fine and swimming around in it and very alert. Then i put him in the tank and everything went down hill. For his tank i tried something different as well. I used tap water and tried "Fluval Aqua Plus Water conditioner" about 5ml for my 6 gallons. As soon as he hit the water he went into what i talked about above. IDK what to do and am very concerned about him. could it be a response to those new chemicals that i have never tried before? Any help is greatly appreciated. Also, I added the same water conditioner to my 15 gallon tank that has 2 small goldfish and a better fry (not aggressive at all) as i decided to do a water change while setting up the betas tank and they are doing absolutely fine, not response to the chemicals at all. I also added gravel to the tank. just some pea pebbles from home depot. i washed them for over an hour. saw on another thread that it was safe to use and many had success with it.