can I keep an amazon tree boa in a 25g rubbermaid tub for a while?
Do as Sylvias said. You'll be able to progress much faster with hots that way as you shouldn't develop many, if any, bad handling practices if you have a good mentor.
If you're set on getting a snake to practice using a hook, then get a WC Amazon tree boa as they tend to display a decent range of behaviors that give you a bit of preparation for more than just arboreal hots. An ATB will most certainly latch on to you if it gets the chance to do so, and it's not a fun bite at all. A WC blood python isn't as good of a trainer.
Also, mangrove snakes are pretty hot for being rear-fanged & all, and there are recorded instances of severe bites that were comparable to a severe copperhead bite.
The ATB is a good idea. I was unaware of any recorded mangrove snake bites being so severe. Who documented that. It is not that I don't believe you I would just like to read it.
Get some copperheads to start. Generally wont cause any major permanent damage. There cheap, easy to obtain. most are very aggressive. And a great snake to learn with. I think this would be a much more realistic transition into hots.
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I hear that all the time, but let us not kid ourselves, Copperheads can mess you up bigtime as seen here>
http://www.venom-center.com/forums/index.php?topic=2752.0