Re ornaments, if you are getting any coral, stone, wood etc soak them for 24 hours in the bath prior to putting them into the water - gets rid of any dust particles/dirt etc which might contaminate fish. you have to have the water in the tank for about 8 hours before putting fish in to regulate the temperature and when you put fish in just float the bag on the top of the water to allow the water inside the bag to reach the same temp as the tank water. Buy yourself a couple of those sucker fish they will clean the glass on the inside of the tank as light causes algae to grow. if you are changing filters don't change them all at one time - fish need a certain amount of bacteria in the tank.