Hi, I've had my russian tortoise for a while and I've always sprinkled a little reptivite on his food a few times a week. I have read differing things about vitamins, including that possibly centrum for humans (crushed) might be the best thing? I'm about to order something new since I"m running low and also because my stuff is old. Anyone want to steer me in the right direction? I also recently started scraping a little cuttlebone onto his food. He doesn't seem to like it though.