Here's the syringe end of a DIY device I use. It's a common syringe like those used to medicate infants. It's attached to a length of rigid airline tube with a little piece of flexible airline. There's another piece of flexible tubing on the other end to soften the effect if I accidentally strike a coral with it. Adjust the length to suit you. Just thaw frozen food in a cup and draw it up into the syringe. This is a terrific way to target all kinds of corals and a couple of fish that are timid feeders. I feed Duncans, Frogspawn, Hammers, Candy Cane and Sun corals with it. I also use it to feed my Mandarin and Randall's Goby and a Porcelain Crab. Give it a try.