Ok so a friend of mine bought a betta some time last semester he lives in a tiny vase and she has had him for maybe 3 months. well she doesnt want him anymore so I have made plans to pick him up on tuesday I have a 3 gallon tank thats empty, she says that his water hasnt been changed in prob a month she works 40 hours a week and goes to school full time. So I am curious as to the best way of bringing him back to health? should I put him in a 3/4 gallon first to keep an eye on him until he is better, should I do a salt treatment along with clean water? as far as I know he isnt doing too hot and she hasnt changed the water for a while I dont know whether he is eating or not she does give food. I want to be prepared for this new guy before I bring him home.