Not to the meleagris, I'm sure. :lol:My Big male Calvus would, just occasionally put one of the adult Stappersi/Meleagris in his mouth for a minute! He never actually ate any of them and they seemed no worse for the ware. It was interesting.
I would stick with 3 species in a four footer, and only do jumbo cyps in 6 feet if a mixed species tank. I've heard of success breeding jumbo's in 4 feet, but that'd be in a species tank.