You can try to get a plastic tube large enough to fit around/over your corals in question (I cut a coke bottle in 1/2 and use that - though make sure you wash/rinse it out well first). Take the lid off the bottle so air escapes as you lower the tube carefully over/around the coral. Using a gravel vac plastic tube can also work well. Then drop the food down in the tube onto them, or feed them down the tube with a turkey baster etc. That usually works in keeping others from stealing/munching their meal. I have 8 shrimp in my tank, 4 cleaners, 4 peppermints and they are notorious for teaming up on a coral to take the food from it. I have tried feeding them seperately their own food but they always seem to think that what im feeding my corals is obviously better than what I feed them.
The downside, it can take some coral a while to ingest all the food and you don't want your fish/inverts ripping a coral appart to retrieve a partially digested meal !
Warm Regards,
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