When I refer to acrylic tanks, I mean the thick, hard, clear, resistant kind of plastic, not the cheap thin plastic you get in Kmart tanks or wherever. The acrylic tanks I have are 3/8 " and will withstand stronger impacts than glass. I've whacked a tank or two inadvertently with a mop handle hard enough that a glass tank would have broken; not acrylic. They are not fragile. I've never dropped one but I'm betting that they would fare better than glass in that situation.
Interesting, this is something that would be safest option at the moment (I'm really paranoid with everything that has to do with water and wooden floor right now).