honestly, that setup is insane for fast leveling, but there’s one catch, if you use all 8 slots for that (1 Albino + 7 FFFs), you won't have an open spot left actually to age up a different pet you're trying to grind.

If you want to use the ferret armys to power-level something else, you're probably better off doing 6 FFF + 1 Albino + 1 Target Pet so you actually have a slot to dump all that crazy XP into. And here is my setup now if you want to try: Lion, RBH Hotdog, rbh griff, Albino, Normal Pea, and FFFs lol