I only have a copule years worth of experience keeping them in deli cups, but haven't had any problems. It is much more convienient to keep them that way when you have a bunch of hatchlings. I do like to use small sections of paper towel tube, cut lengthwise into little "C's" for little hides for them, especially right after they hatch. Once they are established feeders I usually take them out and there's no change in their eating habits. Who knows if it makes much of a difference but any little bit helps when trying to get stubborn ones to eat!