Feeding an L. maculata is very different from feeding a gonodactyloid. They can't eat snails or other hard prey. Feeding is best done with a feeding stick. Actually, the animal will tell you how much is enough. If they aren't hungry, they won't take the food and may actively push it away. When the animal is between molts, they will eat a lot. Mine take a large grass shrimp or smelt every day and would take more if I offered it. When they are a week or so from a molt, they will start refusing food and probably won't feed again until several days after the molt.
Lysiosquillina do not normally store food and if they take more than they can eat, they will usually throw out the leftovers. The one exception is if you have a mated pair. The male provisions the female and will take down to her whatever he can catch. If he provides too much, eventually she may toss it out.
I can't remember the size of your L. m, but assuming that it is about 6-7 inches, the male, when feeding, will take a piece the size of a large marble daily.
Roy