Hi again.
The dimensions of an 85 gallon are more than plenty for an adult.
I will say, though, that glass aquariums are kind of a pain- I'd suggest looking into a plastic cage such as Boaphile, Proline cages, or Animal Plastics- they're very sleek looking, can be picked up by one person, and hold humidity and heat WAY better than a tank will.
That's not to say glass can't work, just that in my opinion it's a constant battle to keep it heated, humidified, and un-scratched.
You can move a baby snake to a permanent large cage relatively quickly, provided that you have TONS of hiding spots for security- I gave my 4 month old five hides and a few branches to hide behind. Even an empty paper towel roll makes a great hide for a very young boa.
I personally don't feel that a misting system is necessary and is rather a waste of money for as little as you would have to use it. While these guys like reasonably high humidity, keeping them like a rainbow boa or something will lead to disaster and infections. Misting them with a decent spray bottle once a day or so is more than plenty.

As far as lighting goes- I personally just have a 16" or so plain fluorescent fixture installed in each cage kept on during the day- this is just for viewing them, and to provide them with a light cycle since their room is kind of dark. Some folks say that UV light brings out their colors or something, but these kinds of snakes don't spend much time in direct sunlight.
Use one if you want, but totally unneeded. A cheap under cabinet fluorescent light is a great choice.

Change to aspen bark after several weeks, if you want, once you are sure it's healthy. It's fine to keep it on newspaper or paper towel forever, if you want.
One thing to mention is that you don't want to feed it on the aspen. Put its food on a sheet of paper, or feed it elsewhere, if you're going to use aspen bark.

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