That tank probably has another six months before it needs regular pruning or else the stuff with start to kill each other as it touches.
You can get a tank like this in about three years from 1" frags if you have the best of breed water quality and lights and an already-established tank - this is with acros. If you have birdsnest, montis, stylos then you will see why hard core SPSers won't let any of them in their tanks since they can take over a tank even faster. 10% monthly water changes, MH, CaRx and near-zero nutrients, but not ULNS, will get you there the fastest IME.
Once the colonies are about the size as the ones in the first post (baseball to softball size), you will see if your tank has what it takes to continue. Colonies are a totally different animal than frags. They need more light from more angles (this is where reflectors or wide 8-10 bulb T5 setups have a huge advantage). This size the point where some start to recede from the base up and just grow at the top - this is when you know that you have to up your game to grow colonies or just prune back and start again with frags.
I used to have the LFS guy come and prune my tanks every month or two. He would do all of the work, sell the frags and let me know how much he owed me in credit - he would do livestock or dry goods which is where I got my tastes for deepwater and higher end reef fish since after a while it is hard to spend all of the credit. He would also make sure that I got the best stuff to keep me as a supplier. This is a good win:win since LFS always loves high quality local frags of named corals and I did not have to do much work. He could easily take out 100 frags at $10-30 credit every month, or so. If you can find a LFS to do this, then you can have a really great time - if you can just keep them stocked with the basics like Cali, Oregon, Pearlberry, Lime in the Sky, a nice Tricolor, Blue Matrix, Garf, Pink Lemonaide, then they will love you. If you can mix in a Purple Monster from time to time, they will love you even more.