Mine suck up a lot of water. Maybe yours are adjusting to their new home and are stressed from being moved and replanted?

Two days is not enough time to judge ther personality of a plant.

The roots need to be covered in water. The stems should be out of water. How deep did you plant them?

They are 19-20 inches high, each of them is in a separate vase about 8 inches high (so a lot of the stem sticks out), the marbles go up to the top of the vase, the roots are probably about 1 inch from the bottom of the vase, and the water is filled about two inches. So far I still haven't noticed any change in the water -- I suppose it's a bit early, but I just was concerned that if they weren't taking in water, they'd die.

Anyone else have other ideas? The water level still hasn't changed, but I think I'm noticing new roots that I hadn't seen before. This is really strange...

I think you should determine your success by how your plant looks rather than how much water it's taking up. If the plant cells were not filled with water as they are supposed to be, your plants would begin to wilt, brown, and die.

If the room is on the cool side and the plants are basking in a lot of natural light, they won't be doing a lot of active growing. So not only is there less evaporation but less transpiration. This is pretty normal for this time of year in much of NA. If you grow other houseplants, you'll know that you have to greatly reduce watering in the fall/winter.

Correction: if your plants are NOT basking in a lot of light. That makes more sense, right? ;-)

Hah, yes it does, I figured that's what you meant.
Thanks, I will keep an eye on them -- I have them away from the window because they aren't supposed to get direct sunlight. So far they are pretty green (alternating light and dark) and the leaves seem to be healthy, I was just a bit confused. Needless to say I do not have a green thumb (I've killed cacti before), and I had though these would be idiot-proof...

Just because other's are having the water disappear faster doesn't mean that their plant is drinking it. Maybe its evaporating. It's very dry in my house and things dry out very, very fast. I have to watch all my plants for this and try to mist often.

scott, you'd be surprised at how challenging it is to grow terrestrial plants (or those that are 'supposed' to be) in water. ;-)