Your best chance is to feed small particulate foods of many different types, especially at night (if that's when it crawls out and opens up). In order to keep it, though, you almost have to threaten the very balance of your tank with cyclops, phyto, baby brine, rotifers, other types of zooplankton (invert banquet by Fritz is very potent and seem to make a difference to them). Again, you'll have to have moderate flow and the maximum food sources that may put your tank in danger and you'll need to skim like crazy and have your refugium full of algae and use phosphate binder and change your water frequently. It's probably tough on some of your corals to try this, and I wouldn't recommend it.