I save their egg shells in a zip lock bag in the fridge until I get a dozen or so, which is enough for my 4 girls. Then I bake them in the oven to get them to easily crunch up, let them cool and give it to them, use your own judgment for how long in the oven. Every so often I scramble 4-6...
I've been doing a lot of research the past few weeks and I have seen a lot of success with hydroponics on the internet in videos and youtube. Yes, indoors, planning on giving it a go!