Substrate is all sand. The day I put them in one of them got a little nip in his dorsal, but he seems to be doing okay now. They are eating. I have another pair of cories (pandas) that used to be in the same tank as these ones (juliis), but when I shut down that tank I put the juliis in the bigger tank and the pandas in the 1o g because they're so tiny, I'm afraid they might get picked on.
Anyway, thanks! Babies would be cool. I had some mollies that started having babies when I first stated my hobby, but had no idea how to handle it so they just all died or got eaten. I will NEVER again have mollies. They ruined my first aquatic experience.