Those are not flying foxes, but siamese algea eaters, Crosocheilus siamensis, a close relative of the flying fox, Epalzeorhynchus kalopterus. They are really good algea eaters.
lol, yeah i kinda had a bad feeling when he gave em to me!! dun worry if they can withstand a couple of more days they'll be back in the LFS, just godda keep my tems full!! hehe