buy a CYCLE is say it will cycle your tank in a week. I have used it before and it seems to work. also if you put the fish with ich in a salt water solution with 3 tablespoons for every gallon and let him soak for an hour and then put it back in your tank. by the end of the treatment most or all of the ich should be gone and add some salt to your tank about 1 tablespoon for every 5 gallons. All salt used should be non iodized you can buy it at any grocery store. Also do not clean your filters for a while so they have a cance to grow the bacteria.