well, lots of inverts are sensetive to amonia & nitrate that is in your water during the curing process. However, if this is not an issue (i.e. water tests show your skimmer etc.. is keeping up w/ this) then you can add some crabs w/ will help clean up the liverock.

there is really no reason to add snails or other creatures until you see a need for them, i.e. algae = time for some snails.

However: i would like to encourage you to take this VERY slowly.

here is why, the minute you add anything to your tank, even something as simple as a crab, you have added an opportunistic predator that has 'limited' your tank. i.e. that crab is going to eat microfauna and other goodies as well.

my reccomendation - and one I followed for almost a year on my first tank.

Don't add anything but snails for around 6 months. this will allow all the microfauna, bristle worms, pods, sponges, etc... to develop in your tank in peace.

You don't have to do this by any means, it's just an idea that i enjoyed, and i liked the micro-life in that tank more than any other tank i have ever had since.