I started to grow tulips in a glass vase with glass marbles. they have been doing really well. they have grown leaves, and are fairly tall, maybe two weeks from flowering, but the 2nd and third leaves that are trying to grow died, like they may have rotted. the bulbs look fine and water is where it should be. Will they ever recover and flower? what HAS grown still looks healthy.
Make sure you are changing the water frequently.
Here is a link with more information.