Stable params in an established tank, decent light, and light feedings like mysis will help.
Moderate flow.
Time varies, just leave it alone as much as possible, let it settle.
0 nitrites or amonia is a given for any animal, but some nitrates or phos should not effect it much if any, so don't stress too much on that.
It's common to have some detection of both, just not excessive.
Other corals like sps are more vulnerable to higher trates or phos.