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That's great that he is feeling better! It did look like he was a little bloated, so a fast would help that. Another thing that probably brought this on was the sudden change to the new water. Fish are very sensitive to water parameters such as pH and hardness levels, so all changes should be done gradually. To avoid this in the future, float the bag with the fish in it in the new tank for 15 minutes to let the temperature adjust, then open the bag, remove 1 to 2 tablespoons of water and replace it with the new water (depending on initial water volume). Do this every 15 minutes until the fish is in all new water. Then, they should be properly acclimated when put into the main tank. I usually acclimate new fish for at least 1 hour, and I take up to 2.5 hours with sickly ones. You can also set up a drip line, but there is usually not enough water in those little betta containers to do this. However, if you want to know how I'd be happy to explain it to you. This is the method that I use with most of the new fish I get.
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