I also don't do any additives...just do weekly water changes...I've already got great color and great growth, but I'm sure it could be better with doing more...I'm a big pusher on keeping your hands out of the tank as much as possible...I only go in if things are getting burnt or have fallen over. I did not do anything to the coloration of the photos and they were originally raw and just converted for the sake of it being easier to post.
Most corals I received from my bf's tank were an inch to an inch and a half...hence why I have so many that are still small...I've really only bought 4-5 pieces for this tank, 2 of which died a few days after bringing them home. My German blue digi has more than tripled it size in the last three months. Now that the tank is more established (they say it takes 6-8 mos) then you start to see the wicked crazy growth and coloration...I have to say at this point the last few months have been good to me in the growth department....just need to work on the pest control department