Just a quick sketch of the placement of the lights for the underwater lights. The purple is two black lights at either side of the porch, one strung up using a plug in cord for Chinese lanterns. The multi colored circles are for the jellyfish that will have a rainbow light set off in each of them. Because they'll have to be set by hand, I'm thinking I'll try and limit the jellyfish--I think they'll look cool, but turning them on and off by hand is going to be a bit annoying to do more than once or twice.
The ocean lights will be focused so that they cast their shadow towards the ground. And the blue led string of lights is just in case everything is too dark, and more light is needed.