Have ordered 15 CRS and am wanting to know if there are some "must have" foods for these guys, I understand that water conditions are more important but is a diet of just Shrimp Crack, Kale Tablets, Vege Wafers enough?

There is a large article on here somewhere detailing all the different food that can be fed safely to the shrimp. There is a stack of them. Take a walk around your suburb and look for a mulberry or weeping mulberry tree as it's the perfect time of year to collect the fallen leaves. Shrimp go nuts for them.

Made an order for 25 Mulberry Leaves, was like $10, see how they go.

You need to find a mulberry tree and take a few cuttings. They grow like weeds. I cut a few sticks off mine and trim the leaves off then just stick them in a pot. I keep them wet and within a couple of weeks leaves start appearing. I can't believe the leaves are so expensive. I bought my original rooted cuttings  10 for $65 delivered from an online nursery and now have about 30 or more mulberry trees growing . Next time you come to Adelaide  you can come and grab some.

Might have to look into getting a Mulberry Tree then, haha.