Oh boy...acros can be demanding. I would recommend an H2O change the night before you know you are going to go buy some acro. I usually do this, and this way the coral can adjust into a more inviting environment. As water quality goes down, your coral is more likely to do well than if it had been dumped into the WORST H20 quality you have in your tank.
Thats my .02 on buying acro, especially if you have softies in the same tank.
I would go with some monti caps too. These will keep you feeling good about yourself while you kill your first couple acros...if you do.