The darker greens do have more nutrition in general (in relation to the crappy iceberg lettuce), but are not considered high in calcium. In fact, many, such as kale and spinach bind calcium into unusable oxalates. These are still great foods, but a variety is always key. For your snapper, make sure to include whole body prey to complete the balance. Small fish are also great to stimulate natural turtle behavior, and prekilled, appropriately sized rodents are great to round things out.
To answer your question though, parsley and dandilion leaves are high calcium vegetables.

Ian

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