by small spiders, do you mean T s'lings? I don't think I would feed ants to tarantulas because of the formic acid in them. And it doesn't seem to me that most spiders are very interested in ants. I would recommend getting a colony of lobster roaches. I have one, and the small nymphs are great for my s'lings.kenniey said:Does anyone know of a place to get ant colonies ? I think this would make a great feeder for my small spiders !