URGENT!!! will my fish be ok with this bacteria in the water?

First things first, Don't Panic. Your fish are swimming around now and you changed the water yesterday. So you're OK and so are your little friends. Do test your tank for levels of amonia, nitate, nitrite, hardness etc. get test strips at pet shop or walmart. It is always a good idea to keep a bottle of "Cycle" on hand because it is an instant help. Good luck.