I use tupperware tubs for mine, and I don't use a top for easier access to water and feed. I use a 25 w bulb for basking on newly hatched F. pardalis, it depends on how close the light will be to them. I always use live plants for mine, they seem more comfortable on them. I wouldn't keep 15 together in one enclosure. I have 16 that hatched a week ago and I have them seperated into 4 groups of 4 to keep the competition for food down. Once they start to grow, some will grow faster than others and you group them by size at that point. I can post a pic of my setups later today when I get home.