If you read the above link from Vale you’ll see that fish flavoured cat/dog is not considered bad for hedgehogs, even if they may prefer other flavours.
Sunflower hearts do have an imbalance of phosphorous and calcium, so are best avoided, especialy in large amounts, but as you will see from the table in the post above, not as bad as mealworms, raw chicken and raw beef.
It isn’t a good idea to encourage the hedgehogs to become too tame. They are not pets, they’re wild animals and should be allowed to live their lives in peace. Humans are predators, whether we like it or not, and not all humans like hedgehogs.
In the normal course of events, hedgehogs are solitary animals, other than females with their hoglets. We are, in effect, encouraging them to change their natural behaviour by feeding them together. It seems likely that when they leave our feeding areas, they revert to their solitary nature.
