Snakes, in general, are pretty resilliant. Did I spell that right? Anyhow, they can fall quite a distance and no harm will come of it. Remember, they are muscle from their neck to the tips of their tails. Sliding down from the top of something like a 50 gallon tank, or even 2 or 3 feet from the ground. will hardly slow them down. Just don't drop him from a two story window.
. And, in truth, unless you dropped him on solid rock I don't think that would slow him down too much. I've seen things like blue racers fall six or eight feet from a branch in a tree and hit the ground runnin'.
Quig