I used two Chromis and they are both still alive. In fact, I had a recent bout with what I believe was marine velvet, that killed a Tang and a dwarf angel and these guys are the sole survivors.
Knowing what I know now, I would probably go the ammonia route with Dr Tim's. Any less stress to fish is good IMO
There is also the old "throw a shrimp in and let nature do its thing" choice. That seems popular here and I see nothing wrong with it, other than I am often impatient and would rather my tank cycles in a week than a month (it avoids the stinky rotting shrimp smell too). The additional cost does not matter to me. I see it as part of the cost of what is already an expensive hobby.