My 55g was bought used and let's just say the power filter it came with is a little long in the tooth. Long story short, my wife surprised me with a new filter for Christmas (an Aquaclear, with the carbon pack, "bioballs" and sponge.)
I've had both filters running since Boxing day trying to jump-start the new filter. My question for you lovely gents is how long do I need to run the new filter before safely retiring the old one?
I poked around other forums and google searches but I can't seem to find a common consensus on this one.