How does a scrubber compare to bio balls (wet/drys)?
Bio balls (trickle, not submerged) aerate the water, convert ammonia to nitrate, and trap food (causing more nitrates). Scrubbers aerate the water, consume ammonia, nitrite, nitrate, phosphate, metals and CO2, add oxygen and millions of baby copepods, raise pH, cool the water if you put a fan on it, do not trap food, and weigh nothing (does not hold water), and thus can be outside the cabinet, or on top of the tank.
