Here's a picture of an Orange Monti Digi and a ORA Green Polyp Birdsnest under 108W PC Hood in my 24g nanocube.
As someone who has gone from the stock DX hood to the 108W hood to finally a 150W MH Sunpod I would not even bother. I tried a green with purple rim monti under the stock DX light and it browned out.
It can be done with the 108W hood. If you keep the SPS stocking to a minimum and do weekly water changes with a good salt (I use Red Sea Coral Pro) you won't need to do a lot of dosing.
Advice:
Stick to aquacultured frags, hardier and they keep their color better.
Only try Digi's, Caps and Birdsnests and don't drop a lot of $$$$ on them in case it doesn't work.
Just keep the SPS in the top 1/3rd of the tank and give them flow. If you get bit by the SPS bug (It will happen), switch to a sunpod hood or another MH fixture for best results.
Good Luck