Just wondering.I have a Magnum HOB.When I clean it I leave some of the carbon in and don't 100% clean all the gunk from the filter pad.Reason being, I want to leave a seed for bacteria.But if I'm cleaning it(and rinsing new carbon) with tap water, is the chlorine killing the remaining bacteria?
just stagger your cleaning, don't remove all carbon at once, and rinse everything in tank water