There is anecdotal evidence that fish flavoured cat food should be avoided for hedgehogs.
Put out a bowl of water too. Hedgehogs are nocturnal feeders so any food left in the morning should be disposed of and fresh put out the following evening.
Things that should not be fed to hedgehogs: milk and anything dairy based, bread, cake, pasta, rice, mealworms, peanuts, sunflower seeds and hearts, honey and dried fruit.
Hedgehogs are mainly insectivores but will eat anything, even if it's bad for them, so we need to be their nutritional police!
Three ounces or 75 grams is about a full days food for an adult, so one ounce or 25 grams is as much as we should feed them so they are encouraged to have a varied diet.
Andy