Hi Barlosh
Welcome to the Forum and well done for helping to get rid of the little one’s ticks. Personally, I think you should have released the hedgehog back into the wild as soon as you had removed the ticks. If it is a young one, this is a vital time for it to learn about it’s environment before hibernation. Most hedgehogs have some parasites. It could be a long time before you were sure that every parasite was gone. When/if it grows to be an adult, it will have to cope with some level of parasites. Whilst it clearly needed help with the number of ticks it had, keeping an otherwise healthy hedgehog captive, whilst waiting for more to appear, could be doing it more harm than good in the long term.
You mention that it is very tame. I suppose it is definitely a wild european hedgehog and not one of the pygmy ones which people keep as pets that has either escaped or been let free? Wild European hedgehogs should never be kept as pets.
If you want to encourage the other hedgehogs into your garden, as Jan Marie suggests, offering them cat/dog/hedgehog food and water might work. But also improving the habitat for them.
https://www.hedgehogstreet.org/help-hedgehogs/helpful-garden-features/
If your neighbour is elderly, it may be that her garden has some wilder areas which the hedgehogs might like.
If you do catch any of the others to remove ticks, I would release them immediately (or in a group if the youngsters are still with the mother) and keep human/hedgehog interaction to a minimum. It is actually not good for hedgehogs to become too habituated to humans. Whether we like it or not, humans are predators and it could have the effect of making them less wary of other predators. Also, not everyone loves hedgehogs.
You might like to make some holes under your fence so that the hedgehogs can move around more freely. But it has to be their choice and they need to be able to move around several gardens. Wild hedgehogs don’t need looking after as such, what we feed should only be a supplement and we can keep an eye, out, as you have done, for an excessive load of parasites, if they are ill, etc. Otherwise they should be allowed to look after themselves. So there is no reason why they should not continue to have their ‘base’ in your neighbour’s garden.
https://www.hedgehogstreet.org/help-hedgehogs/link-your-garden/
Good luck.
