Just thought I'd share this.
I ran a strip of mesh lengthwise in a 4' tank just below the surface and then adjusted a small return pump to flow over it. I had 2 old white / blue strips I used to light it (rested on the tank ledge for the glass top).
I got heaps of growth - no need for bubbles (u can see a bubbler in the pics I made for a mate just below it)
Cheers
Snoops