Who is running a macroalgae reactor? Which ones do you recommend?

[virtualserge]

I haven't tried it myself yet but see it as a perfect DIY reactor. A sort of a kriesel tank where water dropping vertically creates circular motion. With lights suspended above the water there will be no surfaces to clean ever:

 

[AdamNC]

If you got the cash I recommend the Pax Bellum. Grows Chaeto like a beast.

I harvest this about every 2 weeks.

 

[tyryfin]

Agree with AdamNC, my PaxBellum is spot on