Whoo-hoo we have just built ourselves a hydro box. I'm so excited, it's like a little science experiment. Should see us out in the shed trying to use our brains and put this thing together, shockin' stuff....lol We were just talking about what solution to put in the water. When is it best to put in the first does. What solution is recommmended etc I'm planning to put my seedling in pebbles down bottom and rockwool around the top of the pot. We are using a simple drip system and a lamp type light. So I'm bound to be asking lots of silly questions in the next couple of weeks!