Thanks. I'm not irritated, just excited. I haven't had this much fun on a project in a while. Thanks for everyone putting up with a n00b. First mod and first time in mod forums. I'm learning the culture, so I'll calm down soon. I have already pretty much decided against the balls. But I'm still just theorizing as to the feasibility of it. I'm thinking, with a 12" tall tube, the limiting factor would be the density of the object floated compared to the water flow (which would depend on the diameter of the tube). When the time comes, if the mood strikes me, I'll play with it. The LEDs are a definite.