Had recently gotten several horned worms for girl. I was trying to gut load with some spinach... after 24 hours I had 3 dead horned worms. Previously when I hadn't try to gut load (dusted those before feeding) they all stayed with several getting huge. What's the best thing to gut load these buggers??? I've read different sites and can't seem to a definitive answer. So please give me some knowledge on what they can eat that doesn't kill them.