My daughter got her betta late Monday afternoon . We had gotten her one of those starter kit aquariums. I believe it is supposed to be a 1 gallon tank. By Monday night we had gotten him in the tank following all the directions that came with the tank. We acclimated him to the water and used the water conditioner and as far as I know followed every step they gave. She waited to feed him until the next morning because the paper said to wait a few hours before feeding and she didn't want to end upon a weird feeding schedule if she fed him then and then couldn't feed him the next morning. (She just thinks that way

) When she woke up on Tuesday, she fed him (3 pellets) and he was swimming around and seemed to be doing very well. By the time we got home that evening, he was sitting on the bottom of the tank not moving. I got worried. We watched him a while a noticed that every once in a while he would get up a little but then go back down. This morning he was up swimming again. She fed him but by noon he was back down on the bottom going up every now and then. Is this normal or is something wrong?
Sorry for the long post but I felt like I needed to set up the scenario so you could get the full story. Thanks in advance.