I'm confused, I keep reading that bromeliads are air plants. Are they all that way? I've seen terrarium pictures where they are planted in the soil and have water poured into them, and frogs get in the water. I bought some bromeliads at wal-mart that were planted in moist soil, and the directions said to keep the soil moist. Of course wal-mart directions don't mean anything, they are always wrong on the VFT directions.