When modern problems call for primitive solutions! HahaI had been pondering different algae reactors but couldn't justify the prices every brand was asking for. Ended up taking a piece of 1.5" pvc pipe and zip tied a thin mat of chaeto to it. Then took a piece of 1/2" pvc and slid it down the middle of the chaeto pvc and wedged it between the front and back glass of the sump. Basically a rod for the bigger chaeto pvc to spin on. Threw a light on it and spin the thing half a turn every night. It has exploded with growth and was free!
sounds like a nifty setup, I wonder if you could direct flow in some way to keep it spinning continuously. Nothing like rotisserie chaeto!