Yep, everything Kris said. Resist the temptation to mess with the tank and/or coral. Leave it alone, concentrate on your tank maintenance schedule and keep your water chemistry stable.
Also, to avoid early heartbreak on your SPS journey, don't buy acroporas. Especially expensive, named acroporas. Start with seriatopora (your green birdsnest - there are other colors available), montipora, especially montipora capricornis and montipora digitata, pocillopora, pavona and hydnophora.
If you do well with these, you consider an inexpensive acropora. I'd strongly suggest a frag that your local shop has that's inexpensive without a goofy name. You might've already realized that there's a correlation between the creativity of the name of an acropora and the price. Sometimes shockingly so. That doesn't mean there's a particular correlation with the expense versus the difficulty of keeping it - most of the price is driven by the collector's impulse; the newer it is to the hobby and the fewer the number of people that have it, the higher the price. Having said that, there's a definite correlation between the disappointment of a failure and the harder it was to come by and the higher the price.
But almost any good shop will have a number of frags of acropora that are priced inexpensively and still look really nice. These are the ones that you want, because there's a very good bet that particular acropora strain grows really well in captivity in both the dealer's tanks and the hobbyists that frequent the shop (i.e., the hobbyists are trading it in).
If you succeed with some easy to keep acroporas, you're ready for something more challenging. In my case, I refuse to purchase acropora with names (other than the scientific ones!), so I choose wild acropora colonies. These can be significantly more challenging than established aquacultured strains. Others are into the collector's thing, which is in some ways easier because the named strains are proven to grow in captivity. Either way, welcome to the deep end of the pool.
