Thank you @hiddenblade, The tank is just temporary as I am building a hoop house to do it in a big way, more caterpillars = more butterflies for the world.
I can't believe how little we are left with when we live in such a big world, I was reading an article that was saying that if we lose our pollinators it would cost £18 billion for man to do it for themselves. when the bees do it for us for free.
Maybe a wake-up call is needed for us killing of our insects.