Not sure about the pump but you can probably turn it back on. Do water changes twice a week, a minimum of 1 50% and 1 100%. I prefer to do 2 100% but thats just me. You need conditioner no matter what so add salt with it. Make sure it is completely dissolved before putting it with the fish. I like to put the salt in a pyrex glass with some water and put it in the mocrowave for about 90 seconds. Then I stir until it is all dissolved and put it in my bucket for adding in water. Then I add like 75 degree water with the hot water and swish it around. Finally I add it into the tank, and wait for it to heat up, add conditioner, and then put my boy back in! Planned and monotonous process.
Good luck :)
Edit: ^ +1 Sena beat me to it lol; I type too slow