1. is this dangerous? will she eat him? If there is a big difference in size, you might have issues. She may unintentionally crush him. She could intimidate him. You definately want to separate them during feeding time. I would avoid housing them togehter until they are similar in size. You don't have to house them together to get them to breed (until you are actually breeding them that is).
2. according to advice i have received from this forum before, I have been keeping my adult at a lower humidity than my baby so what would be the ideal humidity level for both of them? I've heard numbers that range from 60 - 90% relative humidity. But that's just it, it's relative to what your air temps are. I've never measured my humidity for this reason. My air temps fluctuate dramatically throughout the year. If your animal is shedding in one piece, then it's humid enough.
3. when should i start changing their temps to induce mating? Beginning of November is when I start cooling. See Dave's "Breeding 101" post.
4. the cage is roughly 6-7ft long x 1.5-2ft high x 1-1.5ft wide will this be comfortable? since my breeder told me to keep babies in small cages to minimize stress. That is a large cage. Very nice for a few adults. Just make sure to have plenty of places to hide and a nice, large dish they can soak in. I agree with the breeder. Keep the male in a smaller cage for now (10 - 20 gallon size). Not only will it avoid stress, it's easier for the animal to maintain it's body temperature in a smaller enclosure.
Hope this helps.
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Mike Lockwood
www.tooscaley.com