Tinman, tank looks nice where did you get all that stuff?
As for the SPS in there....many of us have chosen to add things to our tank that were not the "standard" practice or safe. Example: Two yellow tangs in one tank, is that irresponsible knowing it might not work? That goes for a lot of combination of livestock but you see it happen ALL the time with success.
Some people may say that putting a flame angel in a reef tank is irresponsible because it could pick at and/or kill coral. How many people (myself a prime example)have done this successfully?
As far as the SPS under PC, yes generally it does not grow as well, but it can be done and has been done even in a biocube. Make sure maxi is pointed towards it and it is getting good flow so it does not suffocate on its own slime and you will have the best possible rate of success.
Also, you got a small frag and not a colony. If you bought a colony and tried it I too would say irresponsible, but not with a 1-2" frag. Please do not let talk such as this from discouraging you to share your tank's trials and tribulations with the rest of the community. This is how those who are new learn.