She's currently in a 10 gallon (12"W x 20"L x 10"H) plastic tub) with some vent holes. The vet's report suggested a 20"L x 10"W for a juvenile. I have a UTH taped to the bottom with the thermostat set to about 93F, the probe taped to the inside of the tank at the hottest spot, under her substrate (paper towels). The tub has half-inch rubber feet to give the UTH some air. The temp directly above this area is about 83-85F. It takes up a little over 1/3 of the floor space. The ambient temperature of the entire enclosure is at a very steady 80-82 during the day and 78-80 at night. I don't turn down the UTH because I'm having trouble keeping heat in. The humidity is a very steady 60%.

As for the inside: left is warm hide, the log is on the cool side, and the middle is water dish (it's under a turned bowl to keep it from spilling). It was hard to get a picture of her whole body, as she moves very quickly throughout the tub before picking which hide she wants. She tends to favor the left (hot) one during the day and the log at night. The substrate is paper towels, and I replace them the moment they get soiled (about every 48 hours) and wash it out weekly.

This was Nagini last night, after about 20 minutes of hanging out on my shoulders under my shirt. When she's had enough, she slithers down my sleeve and starts wondering around--very, active, flicking her tongue and acting the curious escape artist.

Here is the current setup:





I've been concerned that there may not be enough of a gradient because this ceiling is too high and that the snake may also feel a bit insecure. I've been planning to adjust to a flatter tub like this: 6H" x 18W" x 29L":

http://smile.amazon.com/gp/product/B...ilpage_o02_s00


Here are pictures from the week after we got her, just after her shed. She's about 18-19 inches.






Offering fuzzies and pinkies could have been an issue as they are to small even for your BP.
It was the vet who suggested going down to pinkies, due to how thin she is. I've tried both live and f/t pinkies and fuzzies. She acts almost scared of both presentations.

Don't bother the snake for a week. Keep the enclosure very dark, use a towel or something to keep the light out. Give it a live rat pup with its eyes still closed. Weigh the prey and pick one 9 to 12 grams and drop it in very quietly at night. Leave the rat pup in there, no peeping, for 2 days.
I tried week-long isolation before, trying to feed her in the dark. My vet told me to put Nagini in a small enclosure with a live, blind mouse overnight. Didn't work. I tried putting it in the snake's hide and she followed it in. The mouse immediately rolled out of the hide as though Nagini just kicked it out. As you can see, she is very thin.

There is no target weight there is healthy look so this is what your goal is.
Could you post some photos/links to healthy looking juveniles? I've only seen adolescents and adults. I wasn't entirely sure about her health when I first got her, but I knew she was very young and figured she would plump up in a better enviornment.

force/tube/assist feeding is something that should only be necessary in the most extreme of circumstances. I'd bet that less aggressive feeding practices and appropriate environmental adjustments will result in a feeding BP. additional stress is never a successful approach.
Vet gave me a list of tricks to try, but told me to bring her back in if she dropped to below 50g, which happened. She said she was concerned that the snake wouldn't be able to process a solid meal due to the fact that she hadn't eaten in so long and gave me a detailed lesson on how to tube feed, hoping it would get her metabolism going.

Did you buy the snake from a pet store that specializes in exotic animals, or did you get it from a big box store (PetSmart/Petco)?
PetSmart: she was a Christmas gift from my husband. If I had purchased it, I would have done more research on other options.