Tort's enclosure has been the home of MANY fruit flies. About a month or two ago if found where they were nesting and I soaked every rock/toy and even his calcium block for a couple of days, then I left them out to dry for even more days. I also changed his bedding. I haven't seen any fruit flies since. Today I moved one of his rocks to find that they are nesting again and i was wondering if there is an easy way to eradicate them, as I have a feeling they will just come back again if I just do what I did last time. I'm also wondering if they can do any harm to my Tort.