An idea about random flow.

I was thinking one day, I know impressive right :P, all the powerheads are stationary. yet we need random flow throughout our systems. so why hasn't anyone created a powerhead that moves along the glass by itself in a random pattern? kindve like certain swimmingpool vacuums. ive been thinking about this for awhile and just cant figure out how you would get a PH from point a to point b. it would be easy to have it on a track, but that would look a bit tacky. it would be nice though.



just a thought, gotta document this stuff lol