Hi,
If you are going to order silkies: these are very good as staple food. A lot of proteins and minerals, low in fat and a soft shell so no danger of constipation. Also, they contain a lot of moist so the need for extra water will be minimized. The objective could be that these are hard to maintain as they eat a lot (I think you can order food for silkies as well and this will keep up the nutrional value of the silkies) and have to be put in a clean tank daily. But the butterflies can be fed as well, so you can put these in the tank when they have hatched by accident (takes about a week or two).
Keep giving phoenix worms as well, it is said that these contain something which minimizes the change of coccidiosa. And that is a very good thing.
Cheers,
J.