Questions From a New BP Owner

[Vayra]

Hi everyone! I've been wanting a snake for almost a year now and last week I was finally able to get one. I have a question or two about her tank and food that I was hoping you guys could answer.

I bought her a 30x12x12 tank, the temp on her warm side stays about 82. She has two hides and store bought tree limbs for her to climb on along with a water dish that seems about the right size for her. I don't know exactly how old she is, but she seems a healthy size and she's about 16 inches long. I know bright light is bothersome to them, I was curious about keeping them on a day/night cycle. I have two lights, a bluish one for 'day' that is brighter and a low light, reddish, one for night. Generally the only light that is on in that room is their lamp. Will the bright light during the day be stressful to her or is this setup alright, alternating between a bright and dim light for day and night? Also, is it a problem if the humidity isn't consistent throughout the tank? Her cooler side has 50-60% while her warm side generally is 30-40% as a result of her light. Also, she seems (that I have noticed, I don't watch her a whole lot during the day) to spend most of her time during the day in her cooler hide and at night, she'll curl up on the branch/ground right under the lamp or over the under tank heater (she doesn't just curl up there, she explores and climbs around the rest of her cage too). The temperatures, for as far as I can tell, stay the same within a 1-2 degree difference. Does this mean her tank is either too hot or to cold or is this behavior normal?

Also, I got her just over a week ago, just after she'd eaten, and today is feeding day. I haven't fed her yet, but I was looking at the frozen mice I bought for her. They are fuzzies and the lady at the store says she eats 2-3 at a feeding. They seem kind of small for her, honestly, and from what I've read people only talk about feeding ball python's 1-2 mice a feeding. What size food should she be on? And if I make a guess as to size, for her food, and it's too big will she hurt herself eating it or would it just be a case of she refuses to eat (and of course I'd have something smaller to offer her after if this was what would happen)? I will be feeding her the mice I have this week, but I didn't know if I should maybe buy bigger for next week.

Sorry for the long post and excessive detail, but I've never owned a snake before and I'd really like to make sure her new tank and everything is good for her.

Edit: Also, as a note, her under tank heater and heat lamp are on the same side of the tank, which I assume is correct? If I'm wrong, please let me know.