Looking for advice on my first tortoise. He’s a 4 month old marginated. I’ve done lots of research and I want to do a really good job. I’ve found conflicting info on feeding. He is captive bred which I really sought out and his breeder said to stick with romaine lettuce, kale, and very little strawberries and other greens that are not spinach. I’ve done this so far but I’m worried about calcium. I don’t trust pet store supplements or want to do cuttlebone. Is it safe to use egg shells and how much should I use? Pic of my Terry for attention!!