I use them in my feeding mix for my SPS/LSP tank. I only found something's took them just on their own and others didn't respond. However, if you make a good mixture that excites everyone and all the polyps open up, they'll likely catch them and eat them. The decap eggs don't have much of a "smell" to them (in that the corals don't seem to detect them), so you don't see much of a response when you try to just feed them. They're easy to feed SPS taks with at night because all the polyps are out hunting anyways.
The leather will likely catch them but I wouldn't expect the GSP to go them (they don't really actively catch prey it seems), and sun corals are picky SOBs at the best of times.
Try making a good feeding mix has all the feeds that all your corals like. Put fresh prawns, mussels, clams, oysters, mysis, and other seafood in a blender with a touch of water (not too much) and blend to a disgusting smoothie. Then add fish roe (capelin/masago), decap brine eggs, spirulina, reefroids (or similar) and some of the fauna marine products if you have them available. Give it a quick whiz to mix it all together. Then freeze it into cubes. You can find tiny ice cube trays or you can put some eggcrate on a cookie sheet to make a mold and pour it into there, then freeze it and then store it in a bag.
Feed only small amounts as its quite strong and, because it's full of lipids, it'll make your skimmer go nuts for a bit (so you might as well shut it off while feeding). You can play with the amounts of each component and don't even need to add them all. You'll eventually find a mix that your corals find irresistible. Even my more stubborn corals will come out for that mix.
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