My boyfriend and I have just set up a new 20 gallon tank. We put 3 zebra danios and 1 long gold finned danio to start cycling. Our filter broke a few days ago and we went out to buy a new one, and have had no problems with the tank since. We lost one zebra danio during the week. But today while I was at work, my boyfriend went out to "surprise me" and bought four new gold finned danios and another zebra. So now we have a total of 8 danios in a tank that is less than a week old! It's been a few hours that they've been in the tank and all seems well so far. But I know that ammonia-fighting bacteria haven't grown enough to handle 8 fish. Is there anything we can do to help the bacteria grow and not lose any fish? We're planning on doing daily water changes to help keep ammonia down; is there anything else we can do to help? Thank you!