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Chia seeds are safe but only a very small amount, you can give a few as a treat once in a while or try sprouting them.
White, black or striped sunflower seeds are all fine, they do have a lot of good nutrients but are high in fat & phosphorus so you shouldn't give too many, again find as a treat now & then, better than most commercial treats.
Golden flax is virtually the same as brown it does have marginally less nutritional benefit though so I would stick to brown.