Senator,
I've kept neonates on water in various size cages without any problems. Two things to keep in mind though: first, ATBs are not 100% arboreal. Some individuals appear to be throughout different phases of their life, but overall, ATBs seem to like to spend a fair amount of time on the ground- particularly in the day. For this reason, i've usually modified Ralphs recommended neonate set-up just a little by setting a slightly covered, yet empty waterdish at the bottom of the cage. This became their terrestrial retreat, and was used often.
Second, you're right about changing the water. If you don't have an efficient system for it, dumping a 55 gallon tank twice a week could get pretty tiresome, not to mention the disturbance it would cause the neonates. Maybe if you had an aquarium filter it could work out nicely...could create some pretty cool looking vivariums too.
Tyler
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"There's nothing more freeing than to be confined to live only in what you know is true..." John DeRuiter-
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