Ok, so my wifes tank is a 29 gallon, which has been established for over a year with an Aqueon HOB filter. I've replaced it with a Marineland 200 HOB with the bio wheel. Both filters are running right now, but i intend for the Marineland to replace the Aqueon. Im wondering how long until the bacteria build up on the bio wheel, so i know when i can remove the Aqueon POS.
