This might already have been covered, I did look but didn't find exactly what I was looking for. The garters I'm getting are eating worms & guppies right now, so I'll continue feeding them that for now & later will add pinkies & some other types of fish as well. From what I was reading it sounds like most everyone would suggest using calcium with the nightcrawlers, right? What I wanted to know was how much calcium to use? I was given a free sample of Repti-Calcium with an order I'd placed, is that brand okay to use? Thanks!