2 1/2 weeks seems awefully fast. Did you get an ammonia spike?
if so, then I would suggest, first, a 20% water change. It's good to "freshen up" your water after the cycle, it will help some with the nitrates. You could add a clean up crew, they'll help scavenge the remaining bits of die off from your LR
(assuming you have LR
as you're bringing up a clean up crew) what and how many.. personally.. I love the black banded brittle star.. he just looks cool and he's easy to keep. A handfull or two of hermits (some don't like them, I do) and a couple of snails.. turbos are good choices.
The fish you put in your tank are your decision. These should be something that you research well before purchasing. There are a lot of beautiful fish out there, and there are a good number of them with special needs that must be attended to. I would suggest nothing fragile until your tank has matured at least a month or so... remember patience is the most important quality to have with a SW
tank.. i know it's tough. belive me.. I've had 1 damsel in my tank for 6 months now because I know i'll be making some drastic changes and don't want to risk subjecting fish to those changes if I don't have to.