he is just sitting in the tank not moving around alot. every so often he will get a spurt of energy and dart across the tank. why is he doing this?!?!

alot of people goldfish are acting like that today, mine are so i did a water change

Have you moved the tank recently or done anything to it that means you have had more contact than usual? It sound like something is scaring him. Is he alone?

Im going to move this to diagnosis as theres a red box at the top for you to fill in to help us more.

Doc as Sandy has said we are going to need the information asked in the box above to help you.

Also since you don't have pming abilities yet I can't pm you about your picture in your signature. It needs to be way smaller. Down to 1/4 the size it is now. Thanks for adjusting that for us.