Just started up a 20 gallon fresh water aquarium after doing alot of research and reading. I set everything up and let the tank run for 72 hours with nothing in it. Saturday I decided to get 6 zebra danois to help kick off the cycling process for a new tank. So far as of today my tank water has a slight hazy look so I think this mean's I'm on the right track. The Zebra's look to be in good health still and are very energetic. I'm only feeding them in the morning with just enough food for them to eat. Don't want alot of extra food floating around. There a fun fish to watch I must say. Water temp is 76 degree's and the Ph is 7.8, I have a well for water at my house that is run through a sediment filter before the water softner and a taste, odor, and color filter before it come's out of the tap. The water is very soft. I'm using a Marineland boi-wheel power filter. It's a penguin 150. I have yet to do any water changes yet, this is where I'm a little confused. Not sure how it will help with the cycling process. Any advice would be greatly appreciated, thanks.