Just be patient and add the two Clownfish at the same time, enjoy them for a few weeks, and then add the Midas. Wait on adding the Shrimp, as they are more sensitive to water parameters being off.
Do a search for "cured rock" or "uncured rock" and you'll find many posts on the difference.
Please don't add any fish or inverts until your parameters are in check, which would include:
Nitrates: 0 - 10 ppm
Nitrites: 0
Ammonia: 0