when talking about soft orals and matting corals like mushrooms, zoas, and palys you have to fisrt understand them. their color comes from a micro algae called zooxanthellae which, through photsynthysis feeds the corals. these soft corals dont have a skelton so they dont need trace elements such as calcium but it is a good thing to monitor to add one more consistency in your water parameters. while most corals will find food wherever they can get it, and can be carnivorous, they dont need to be fed, the zooxanthellae will feed it for you. my reccomendation is to keep them happy and they are happy in a consistent environment (water params, temp, lighting cycle, etc). when things get stressed due to bad water quality it will slow growth.
with all that being said, i still use marine snow, rotifers, reef roids, coral frenzy, marine plankton, and mysis shrimp. i feel that the more options every different species has in the tank, it will take in what it wants. but BEWARE overfeeding will cause problems like algae and bad water quality!!!! like anything, corals take time to grow so keep your tank balanced and relax, sit back and watch, its actually quite fun!!! plus if your corals grew like weeds it wouldnt be as fun to see a new polyp develop!!!