Food is obviously very important. Leopard and star tortoises are primarily leafy green, with some grass, eaters. Be careful to feed foods with proper calcium to phosphorus ratios. They need high fiber. They cannot digest, and it unbalances the gut chemistry, if you give them fruits. Keep it low protein. If you have to supplement with grocery greens go with endive, the darkest green parts of Romaine, green leaf, red leaf. If you can get opuntia cactus (prickley pear cactus) it is one of the best sources of calcium and a great food. Weeds are the best. Dandelion, mallow, plantain, thistle, filaree, sow thistle, milk thistle, wild mustard, colvers, chick weed, hawksbit, hensbit, cats ear, nettles. Lots of plants you can grow are also great foods. I grow as many edible plants as possible anywhere I need plants in my landscaping: Mulberry leaves, grape leaves, hibiscus leaves & flowers, Rose of Sharon, rose, gazanias, petunias, pansies, hostas, honeysuckle, geraniums, leaves and blooms from any squash/pumpkin/cucumber, most succulents like jade or aeonium. Grass is also great for fiber, so start adding a bit of fresh cut grass on top of the food. It may take a while, but they do learn to like it.