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Grit can be offered any way that you're comfortable with. Mine is on the ground (but everyone is different). Barley generally contains (or retains if you prefer) more of the minerals that it picks up when grown, but again any whole seed will work. Wheat works quite well, oats can be a bit hit and miss dependant on the source. If you are already feeding whole grain of some description then start with that - as you already have a supply! Else, barley is a good one to start with. Nutritionally it is better than some of the others and it is relatively easy to grow.