This is what I've done in the past with good results. Move as many decorations from other established aquariums as you can. Add a bucket of gravel vac water to the tank. Let run for a day. Add the fish you want and filters from other tanks(leave on for about two weeks). Don't feed for several days after first adding fish, after which, keep the feedings light for another week. Test water frequently and perform small water changes as needed.