reason I also say this as hints have been thats it could be really low cost, we should have things laying around already to make it.. If you have been around tanks long enough most folks have air hose a air stone and a pump..
A good designed one would eliminate a few of the issues we have with the current design.
That is if it actually works.
say if its a cereal box shape clear acrylic with water entering at the bottom of one side or two.. pushing water up and over a weir style or exiting another hole at top with pipe connected to return to tank. air stone at the bottom creating more up draft and injecting the air.. or a bubble master pump injecting air like a skimmer.
perfectly configured leds to blast it with..
I also saw a guy on youtube that had dumped a screen into his tank at the back and had an air stone under it (fresh water tank) and was growing green stuff under his normal tank light.. not sure if it was the right green stuff but non the less it was growing.. I thought if the bubbles were smaller and better light that could work..