Actually I have considered running an algae scrubber on the system, and is the reason why I incorporated the refugium from the first design phase. It's about 80 or so gallons, and although has taken a bit to really get going, had recently taken off in the algae growing department. It's filled with about 100lbs of rock as well...and hosts a perches clown and line blue damsel that were gifted from a buddy out of his 10 gallon.