OK that's all well and good but the spiders owe Harry a life debt for destroying the snake in the first place. Thought I'd mention it. It's nice that they have a new home, however. :-D
Author's response
Perhaps in another HP universe the acromantuale will honor a life debt, but in this one they are making a nest under the best food source they could hope for . . .
More in the next chapter.
N!