New Lagoon Set up...

[Zoaelite]

If you covered the opening of your tube from the powerhead with liverock instead of pouring out you could have a "Trickle Effect" down the rocks. If the tank is that large I would go with atleast 2 250W but I would suspend them from the roof so that you have added splash onto your live plants. As far as rock out of the water goes I would use somthing like a cheap travertine or dry argonite. No use wasteing cash on $7.00 a pound live rock if its going to be out of the water.