Too much protein in their diet causes shell curl. Back off on protein and your turtle will be fine. I fed my young ones kiwi halves, frozen peas, and (every third day) Ken's earthworm sticks and rabbit pellets. I also keep bunches of anacharis for them to graze on. When kiwi fruit wasn't available, I gave them zucchini, shredded carrot, and potato slices. As they mature their protein requirements increase. My 2 and 3 year olds still get kiwi but, they also look for meat in their diet. So, I offer them catfish pieces, raw shrimp, earthworms (and earthworm sticks), and the occassional live minnow. Their substrate includes crushed oyster shell for calcium and I keep cuttlebone in their W/D filter. I also keep Dr Turtle's sulpha blocks in the W/D reservoir to prevent skin and shell infections. My 4 y/o FRT get's every thing listed plus 2 cubes of VHP frozen food a week.